What's new in Hercules

What's new in Version 4.6

Release date: 9 June 2023
Official Source and Binaries: Release_4.6

SECURITY: New "\reply" SCP command to suppress command echoing of passwords (Fish) (#541)
Fix endianness bug in PFPO instruction (#523)
Fix some endianness issues in TRTE and TRTRE instructions (James Wekel) (#529)
Fix CODEPAGE message corruption in HERCIFC (Bill Lewis) (#525)
Fix some minor z/Arch Facility related bugs (Fish)
Fix BZIP2 API bug in hetlib.c (Fish) (#535)
Fix missing last dump line bug in dasdutil trace (Fish)
Fix crash if "ctc debug" command on unconnected CTCE device (Fish) (#536)
Fix segfault in 370 mode IPL (Bill Lewis) (#538)
Fix to show version and help if no arguments given (Fish) (#540, #548)
Fix incorrect NUMCPU/ARCHLVL/etc handling causing occasional hang (Fish) (#542)
Fix branding SNAFU: "SDL" does NOT mean this Hercules is a "SoftDevLabs" product! (Fish)
Fix bug causing MVT guest to fail (Fish)
Fix Program check detection if PER trace active (Fish) (#560)
New: 'QUITMOUT' command/statement, per user request (Fish)
NEW: "Trace to File" support (Fish) (#33)
New "t+CPU [cpuad]" selective instruction tracing by CPU (Fish)
NEW: Sockdev socket punch support (Fish) (#553)
New 'txt2card' utility (Fish)
Don't enable STHYI/ESSA by default (#531)
Improve PFPO instruction conformance (Fish)
Add single devnum support to CKD Search Key trace command (Fish)
Enhance "t?" command to also show active device tracing (Fish)
Improve CCW tracing (Fish)
Add "ADDFRR" MVS assist (Jay Maynard) (#537)
Better HMC message handling for Linux guests (Fish) (#534)
Document MAKETAPE via README (Fish)
Add support for dasd X'F7' (DSO = Define Subsystem Operation) CCW (Fish) (#547)
DASDLOAD: Increase MAXDSCB and allow cmdline override (Fish) (#566)

What's new in Version 4.5

Release date: 27 November 2022
Official Source and Binaries: Release_4.5

Significant performance improvements to CLCLE, CUSE, TRE, TRTE, TRTR and TRTRE instructions (#498, #500, #510, #513, #519, #520) (Thank you James Wekel!)
Fix minor bug in STSTU (Search String Unicode) instruction
Fix minor bug in CMPSC (Compression Call) instruction
Fix minor bug in PFPO (Perform Floating-Point Operation) instruction (#407)
PER 1 GRA (General Register Alteration) support (#87)
z/VM TXF PER support (i.e. TXSUSPEND = Event Suppression)
PER SKEY support
PER Zero-Address Detection support
BEAR-Enhancement Facility support
Decimal Floating-Point Packed Conversion Facility support (#496)
Report and ignore oversized LCS outbound SNA messages
Ensure same serial number on all multi-file images (#276)
Fix minor dasdinit negative size parameter bug (#472)
Fix minor dasd CCW data-chaining bug
Improve CCKD handling of unusual/unexpected errors
Minor corrections to CTCE documentation
dasdls: sort display by dataset name
Various minor cckdmap enhancements
Fix rare bug in .HET locate block logic (#518)
Disable CCKD automatic garbage collection (#504)
Fix hang at exit when MLVL DEBUG is active
Fix bug causing DASD corruption with s+ tracing
Fix 'numcpu' handling bug causing crash (#481)
Ensure error message when no config file provided (#483)
Fix another possible Windows suspend/resume crash (#489)
Customized Offerings Driver (COD) support
New SYSGPORT config file statement (#505)
Various improvements to Linux build scripts (#454, #461)
Many other various minor miscellaneous fixes and improvements to both documentation and code

What's new in Version 4.4.1

Release date: 7 January 2022
Official Source and Binaries: Release_4.4.1
Refer to the Release notes for SDL Hyperion 4.4.1 web page for important and more detailed information regarding some of the changes in this release.

Implement new Version string format
Return fullword #of cylinders in RDC bytes 60-63 (#456)
Also show real address for virtual address during instruction tracing
Fix possible Hercules crash after resume from suspend (#458)
Improved B220 (SERVC) instruction validation (#460)
Fix 20 yr. old CCKD compressed dasd bug causing Locate Record to fail (#464)

What's new in Version 4.4

Release date: 18 December 2021
Official Source and Binaries: Release_4.4
Refer to the Release notes for SDL Hyperion 4.4 web page for important and more detailed information regarding some of the changes in this release.

Fix many SIE arch-dep violation bugs
Fix to SIE handling of STFL/STFLE instructions
Internal and SIE SKA Storage Key handling fixes
Fix VM/ESA OPERATOR userid looping bug
Preliminary SIE ESSA/STHYI instructions support
Fixes to MVS assist support (#391)
ECPS:VM 1.88 fixes
ISK/ISKE, IVSK, RRB/RRBE, SSK/SSKE, RRBM, PFMF instruction fixes
Fixes to CSP/CSPG/IDTE/IPTE instructions
Minor LAA/LAAG (et al.) instructions fix
RRBM instruction fix
PTFF instruction support for function codes 04, 05, 69 (#363)
Fix DAT bug in MVCOS instruction (#349)
Local-TLB-Clearing Facility (#77)
Nonquiescing Key-Setting Facility (#77)
Insert Reference Bits Multiple Facility (#77)
Miscellaneous-Instruction-Extensions Facilities 2 and 3 (#77)
PPA-in-order facility (#77)
Allow modifying "IBM" and undefined facility bits (#353)
LCS device fixes and improvements
LCS device SNA support (#348)
3270 device connection improvements (#379)
CTCE device fixes and improvements (#369)
CTCI device fix for VSE (#446)
Minor QETH (OSA) device fixes/improvements
CCKDMAP utility CFBA/CFBA64 device support
Fix to DASDLS utility shadow file logic (#393)
CCKDLOAD utility fix (#374)
Fix dasd utilities r/o access to r/w images (#355)
Minor "faketape" emulated tape format fix
Fix possible CRASH during compressed dasd attach/detach
PANOPT statement "MSGCOLOR" option
PANRATE/PANTITLE replaced by PANOPT
Minor MODEL/PLANT/MANUFACTURER statement fixes
New -o/--output/--logfile command-line options
Hardware loader fix (#185, #337)
Minor Rexx support fixes and improvements
Minor External Packages updates
Fixes to herclin.exe
Translation Specification PIC 12 fix
Improved TXF reliability and completeness
Predefined CPUMODEL $(symbol) values (#263)
Improvements to building Hercules on non-Windows platforms
Improvements to building Hercules on Windows platforms (#448)
Many other minor internal/external fixes and improvements

What's new in Version 4.3

Release date: 28 November 2020
Official Source and Binaries: Release_4.3
Refer to the Release notes for SDL Hyperion 4.3 web page for important and more detailed information regarding some of the changes in this release.

Fix ULONG_PTR typedef build errors on RHEL 6.10 (#245)
Add missing 3203 printer to DEVEQU table (#250)
Fix driver code incompatibility with other Herculeses (#251)
Fix issue where thread names are incorrectly set (#254)
Fix missing timestamp in daemon mode; add DATESTAMP option (#259), (#260)
Fix CNSLPORT to honor new updated setting (#318)
Watchdog monitoring reinstated.
New PANOPT option MSGCOLOR=DARK/LIGHT
Fix hang/deadlock in device-attention function (#277)
Improved CTCE driver functionality (#269), (#273)
TCPNJE device support. Refer to the README.TCPNJE document for details (#280)
TCPNJE Connectivity And Stability Enhancements
Fix RARP (Reverse ARP) Ethernet frame type constant
Fix Linux panel high CPU usage (#289)
Fix z/VM guest architecture switching (#295)
Fix for IPL command without a LOADPARM (#296)
Work around VS2019 compiler C4789 Warning bug.
Fix crash if incomplete network device group defined.
Fix ooRexx v5.0.0. load failure on Apple Mac (#301)
Fix crash in CCKD dasd termination logic (#303)
Fix KIMD instruction
Fix VM FixPage assist
Fix channel prefetch buffer overrun crash (#319)
Fix instruction stepping invalidation/refetch bug (#321)
New z15 Secure Boot (Secure IPL) Diagnose 0x308 support
Preliminary (Experimental) Transactional-Execution Facility (TXF) support (#263)
MANY other internal fixes and improvements

What's new in Version 4.2.1

Release date: 10 September 2019
Official Source and Binaries: Release_4.2.1
Refer to the Release notes for SDL Hyperion 4.2.1 web page for more detailed information regarding changes in this release.

Make HHC02917 a suppressible msglevel debug only message
Fix CKD suffixed read count file protect bug
CKD dasd serial number support
New "dasdser" serial number utility
Fix various VMFPLC2 issues
Fix Linux exit/quit hang when no traffic on tuntap device
Fix QETH (OSA) missing CSCH interrupt under z/VM
Don't pass "&&" async argument to rexx scripts
Fix bogus HHC01111W warning and cctape display
hercifc network interface configuration utility fixes
SIE fix for z/VM z/Arch real mode guests (e.g. zcms)
Various important 3215/1052 console fixes
Various other minor internal fixes and improvements

What's new in Version 4.2

Release date: 8 July 2019
Official Source and Binaries: Release_4.2
Refer to the Release notes for SDL Hyperion 4.2 web page for more detailed information regarding changes in this release.

Load-and-Zero-Rightmost-Byte Facility
Load/Store-on-Condition Facility 2
Full PFPO instruction support
Fix AR/SR/AGR/SRG instructions Condition Code bug
Improved CKSM, MVST, CLST, SRST instruction performance
Optimized CLCL instruction bugfix
CSST instruction fix
TCPIP X'75' instruction support
Improved internal instruction count accuracy
New Diagnose F09 (enhanced F08) instruction
Fix long standing occasional crash in CCKD logic
Fix Shared Devices slow disconnect
CKD dasd suffixed Read Count bug fix
CCKD64 support
QETH/OSA devices HSCH/CSCH instruction fix
QETH/OSA multiple IP address support
Various QETH/OSA fixes
Linux sockdev syn flooding fix
Minor LCS Checksum / TCP Segmentation Offload fixes
CTCT device support reinstated
Tape autoinit fix
3590 Tape C2 Medium Sense CCW fix
Various 3270 terminal handling fixes
Automatic tn3270 IND$FILE efficiency
Enhanced VMFPLC2 utility
dasdpdsu utility fix
Breakpoint/Stepping optional ASID parameter
New PANOPT statement/command
Linux crash dump support (no more machine checks)
Many various overall reliability, stability and documentation improvements

What's new in Version 4.1

Release date: 10 November 2018
Official Source and Binaries: Release_4.1
Refer to the Release notes for SDL Hyperion 4.1 web page for more detailed information regarding changes in this release.

Jay Moseley 'maketape' utility added to Hercules
LRVR, LRV and LRVH eligible added to S37X Facility (Ivan Warren)
Fix long standing SIE host addressing prefixing bug (Ivan Warren)
External Package support simplified and fixed to support Raspberry Pi
QETH (OSA) device support fixes (Ian Shorter, Peter Jansen)
Various Rexx support fixes
DIAG 204 (LPAR information) fix (Ivan Warren)
SoftFloat external package updated to version 3e (fixes square root) (Steve Orso)
Crypto support fixed to use cryptographically secure random number generator
ECPS:VM 1.87 enhancements and bug fixes (Bob Polmanter)
Instruction counting accuracy improved
Fix ./configure so --enable-optimization always honored
Fix dasdls crash
Improved TELNET Terminal Type negotiations
Fix min/max internal thread priorities
Fixes to allow building on Apple MacOS (Enrico Sorichetti, Peter Jansen)
Fix bad commit causing utilities to crash (Paul Gorlinsky)
Performance of TRT, CLC, CLCL and MVCIN instructions vastly improved (Fish and Ivan Warren)

What's new in release 3.13

Release date: 30 September 2017

CTC corrections (Peter J. Jansen)
ECPS:VM corrections (Bob Polmanter)
SIE corrections (Ivan Warren)
PCC,KM,KMCTR,CUxx,CSST corrections (Juergen Winkelmann)
Miscellaneous bug fixes (Drew Derbyshire, Doug Wade, Peter Coghlan, Peter J. Jansen, Alexei Chmelev, Gert Caers)

Download hercules-3.13.tar.gz

What's new in release 3.12

Release date: 30 November 2015

dasdload corrections and support for loading ASCII TEXT files (Roger Bowler)
comm3705_RU-size+unack_attn_delay patch (Juergen Winkelmann)
CCKDDUMP/CCKDLOAD support for DSNTYPE=LARGE (Christophe Varlet)
CMPSC corrections (Bernard van der Helm)
Miscellaneous bug fixes (Peter Coghlan, Gert Caers, Giuseppe Vitillaro, Bill Carlborg, David "Fish" Trout)

Download hercules-3.12.tar.gz

What's new in Version 3.11

Release date: 15 September 2014

Floating-Point-Extension Facility (Roger Bowler)
Enhanced Channel-to-Channel Adapter via TCP/IP (Peter J. Jansen)
Load/Store-on-Condition Facility corrections (Neale Ferguson)
LCS corrections (Paul Gorlinsky, David "Fish" Trout, Ivan Warren)
Floating-Point-Extension Facility corrections (Neale Ferguson)
CMPSC corrections (Bernard van der Helm)
Load sequential datasets from XMIT files (Roger Bowler)
Eliminate compiler warnings for Linux and Mac (Roger Bowler)

Download hercules-3.11.tar.gz

What's new in Version 3.10

Release date: 1 February 2014

Fix incorrect PSW IA in SIE mode with PER (Ian Worthington)
Corrections to build procedures (Mike Frysinger, Dan Horak)
Fixes for Mac OS X (Butch Anton, Adam Vandenberg, Enrico Sorichetti)
Configuration topology facility fixes (Paolo Giacobbis)
Convert BFP instructions to use SoftFloat package (Roger Bowler)
Preliminary support for 2GB page frames (Roger Bowler)
PFMF fixes (John P. Hartmann)
CMPSC corrections (Bernard van der Helm)
dasdls enhancements (Chris Cheney)

Download: hercules-3.10.tar.gz

What's new in Version 3.09

Release date: 15 July 2013

Allow regex replacement variables in HAO commands (Roger Bowler)
Prevent duplicate EQID (Gordon Bonorchis)
Permit concurrent read access to printer and punch files (Roger Bowler)
DFP zoned-conversion facility (Roger Bowler)
Execution-hint facility (Roger Bowler)
Miscellaneous-instruction-extensions facility (Roger Bowler)
Load-and-trap facility (Roger Bowler)
Fix for VSAM Extended Format (David "Fish" Trout)
APL\360 2741 patch (Max H. Parke)
Fix interval timer repeating interrupt (Ivan Warren, Kevin Leonard)
Corrections to build procedures (Mike Frysinger, Dan Horak)
Miscellaneous bug fixes (Roger Bowler)

Download: hercules-3.09.tar.gz

What's new in Version 3.08

Release date: 8 December 2012

1403 and 3211 FCB support (Enrico Sorichetti)
Shutdown on SIGTERM (Frans Pop)
Disable close-window button (Paul Gorlinsky)
Allow larger IPL text (Laddie Hanus)
Drop support for Cygwin, Win98, WinNT, Win2000 (Roger Bowler)
Windows shutdown handlers (Paul Gorlinsky)
Dynamically loadable instructions (Jan Jaeger)
Additional codepages (Kevin Leonard)
Load/Store-on-Condition Facility (Roger Bowler)
Distinct-Operands Facility (Roger Bowler)
Population-Count Facility (Roger Bowler)
High-Word Facility (Roger Bowler)
Message Security Assist Extensions 3 and 4 (Bernard van der Helm)
Interlocked-Access Facility (Roger Bowler)
CMPSC-Enhancement Facility (Bernard van der Helm)
Fast-BCR-Serialization Facility (Roger Bowler)
Reset-Reference-Bits-Multiple Facility (Jan Jaeger)
Access-Exception-Fetch/Store-Indication Facility (Roger Bowler)
Enhanced-Monitor Facility (Jan Jaeger)
Load-Program-Parameter Facility (Paul Gorlinsky)
IPTE-Range Facility (Jan Jaeger)
Enhanced-DAT Facility (Jan Jaeger)
Increase CKD_MAXFILES from 4 to 27 for 3390-27 and -54 (Paul Gorlinsky)
CKD read attention message command (Florian Bilek)
Support 128 CPUs on 64-bit Linux (Jan Jaeger)
Issue Hercules commands via HTTP (Robert Hodge)
Compression performance enhancements (Bernard van der Helm)
Compression bug fixes (Bernard van der Helm, John P. Hartmann)
Crypto bug fixes (Bernard van der Helm)
Hexadecimal floating-point bug fixes (Andy Polyakov)
SCSI tape enhancements and bug fixes (David "Fish" Trout)
3420 sense code corrections for MTS (Harold Grovesteen)
Prevent multiple instances opening same output file under Windows (David "Fish" Trout)
2703 and 3705 fixes and 3791 support (Max H. Parke, Juergen Winkelmann)
Enable GUI support as default for all platforms (Jacob Dekel)
Miscellaneous bug fixes (Paul Gorlinsky, Ivan Warren, David "Fish" Trout, Jan Jaeger, Bernard van der Helm, Roger Bowler, Kevin Leonard, Ian Shorter, John P. Hartmann)

Download: hercules-3.08.tar.gz

What's new in Version 3.07

Release date: 10 March 2010

Fast Synchronous Data Mover Facility (Guy Desbiens)
Diagnose 210, 250, 260 (Harold Grovesteen)
Extended Diagnose 204 feature (Jan Jaeger)
Complete Diagnose 24 (Harold Grovesteen)
Configuration-Topology Facility (Fish)
HFP-Unnormalized-Extensions Facility (Harold Grovesteen)
CMPSC performance improvements (Bernard van der Helm)
uptime command (Fish)
Raise XPNDSIZE limit to 1048576MB (Roger Bowler)
MAXCPU and LPARNUM configuration statements (Roger Bowler)
Add capacity model identifiers to MODEL config statement (Roger Bowler)
SCLPROOT configuration statement (Jan Jaeger)
Add "noclear" option to printer and card punch devices (Jay Maynard)
Socket printer support (Fish)
3705 SNA device support (Max H. Parke)
TTY and 2741 support for 2703 (Max H. Parke)
Tracing enhancements (Jan Jaeger)
Allow configure --enable-external-gui for Unix builds
Enable tun/tap emulation for 64-bit Windows builds (Ivan Warren)
64-bit Windows support (Roger Bowler)
Raise MAX_CPU_ENGINES limit to 64 (Roger Bowler, Ivan Warren)
Numerous bug fixes (Ivan Warren, Fish, Jan Jaeger, Bernard van der Helm, Roger Bowler, Jay Maynard)

Download: hercules-3.07.tar.gz

What's new in Version 3.06

Release date: 11 January 2009

Integrated 3270 (SYSG) console support (Roger Bowler, Jan Jaeger)
HMC DVD-RAM read/write support (Jan Jaeger)
64-bit native version now supported on Mac OS X (Jay Maynard)
Ability to specify IFL, zIIP, and zAAP engine types (Roger Bowler, Jan Jaeger, Ivan Warren)
Console-like message handling (David "Fish" Trout, Bernard van der Helm)
Tape automount CCW support (David "Fish" Trout)
CKD Locate Record Extended CCW (Greg Smith)
Support for FLEX-ES FakeTape tape images (David "Fish" Trout; FLEX-ES and FakeTape are trademarks of Fundamental Software, Inc.)
More complete 3490 and 3590 tape support (David "Fish" Trout)
Solaris build support (Jeff Savit)
FreeBSD build support (Bjoern A. Zeeb)
Panel enhancements:
- Display virtual storage in primary, secondary, and home space (Paul Leisy)
- Display and modify PSW fields by panel command (Roger Bowler)
- Modify control registers by panel command (Roger Bowler)
- Specify IPL parameter by PARM operand (Ivan Warren)
- New panel commands: automount, cmdtgt, ctc, herc, msghld, pscp, scp, sfk (David "Fish" Trout, Bernard van der Helm)
LEGACYSENSEID configuration statement (Ivan Warren)
New instruction feature support (introduced with System z10):
- Parsing-Enhancement Facility (Bernard van der Helm)
- Message-Security-Assist Extension 2 (Bernard van der Helm)
- General-Instructions-Extension Facility (Roger Bowler, Jan Jaeger)
- Execute-Extensions Facility (Bernard van der Helm)
- Move-with-Optional-Specifications Facility (Roger Bowler)
- Compare-and-Swap-and-Store Facility 2 (Ivan Warren)
Many emulation fixes (Roger Bowler, Jan Jaeger, Ivan Warren, David "Fish" Trout, Greg Smith, Paul Leisy, Jay Maynard, Bernard van der Helm, Kevin Leonard, Tony Harminc)

Download: hercules-3.06.tar.gz

What's new in Version 3.05

Release date: 23 June 2007

Prebuilt Cygwin binary no longer supplied; building Cygwin version from source still supported (Jay Maynard)
New system features: Compare-and-Swap-and-Store, Conditional SSKE, Decimal Floating Point, Floating Point Support Enhancement (Roger Bowler)
Extract CPU Time Facility (Jan Jaeger)
Multiple Logical Channel Subsystems Facility (Jan Jaeger, Ivan Warren)
3590 tape support (David "Fish" Trout)
3990-6 control unit and ECKD support (Greg Smith)
Many performance improvements (Greg Smith, Ivan Warren, Jan Jaeger)
Many emulation fixes (Greg Smith, Roger Bowler, Ivan Warren, David "Fish" Trout, Kevin Leonard, Peter Coghlan)
Major SCSI tape fixes (David "Fish" Trout)
Added floating point instructions CGER, CGDR and CGXR (Bernard van der Helm)
Address range options for instruction trace and step (Greg Smith)
Update gpr registers via panel command (David "Fish" Trout)
Console connection keepalive (David "Fish" Trout)
Customizable 3270 connection screen (Ivan Warren)
dasdconv quiet and stdin options (Roger Bowler)
Hercules Automatic Operator (Bernard van der Helm, David "Fish" Trout)
Enhanced symbol substitution (Leland Lucius, Enrico Sorichetti, David "Fish" Trout)
Miscellaneous new panel commands: qd (Greg Smith), fpc, traceopt (Roger Bowler), logopt (Kevin Leonard), cd, pwd, timerint, defsym (David "Fish" Trout)

Download: hercules-3.05.tar.gz

What's new in Version 3.04.1

Release date: 25 March 2006

Fix to allow building for Intel-based Mac OS X (Jay Maynard)
Note: This version only applies to the Mac OS X 10.4 (Tiger) platform. Version 3.04 is current for all other platforms.

Download: hercules-3.04.1.tar.gz

What's new in Version 3.04

Release date: 24 February 2006

CCKD garbage collection fix (Greg Smith)
Reworked timing functions (Jan Jaeger)
Codepage 1047 conversion tables (Kevin Leonard)
Fixed off-by-one-day bug with SYSEPOCH other than 1900; added new config parameter, YROFFSET, and added warning if SYSEPOCH is not 1900 or 1960 (Jay Maynard, Jan Jaeger)
New 2305 CKD disk emulation (Jay Maynard)
Added floating point instructions CEGR, CDGR and CXGR (Bernard van der Helm)
Added support for cgi-bin dynamic modules (David "Fish" Trout)
Instruction fixes: PLO, CVB, CXFBR, CXGBR (Bernard van der Helm, David "Fish" Trout, Greg Smith, Pasi Pirhonen)
Fix for Windows ..\relative path dasd files (David "Fish" Trout)

Download: hercules-3.04.tar.gz

What's new in Version 3.03.1

Release date: 30 December 2005

Fix translation exception bug that was causing some Linux kernels to panic (Fabrizio Calabretta, Greg Smith, Ivan Warren)
TOD Clock-Steering Facility (Jan Jaeger, Bernard van der Helm)
Fix bug in shadow file filename processing on native Windows (David "Fish" Trout)
Performance improvements in TM instruction family (Bernard van der Helm)
Support for Linux zipl LOADPARM of PROMPT (Jan Jaeger)

Download: hercules-3.03.1.tar.gz

What's new in Version 3.03

Release date: 20 December 2005

Native Windows version no longer requires Cygwin (David "Fish" Trout, Roger Bowler, Ivan Warren)
SMP host integrity fixes (Greg Smith, David "Fish" Trout, Bob Deblier)
ALS5, z9 and other architectural enhancements (Roger Bowler, Bernard van der Helm, Jan Jaeger, David "Fish" Trout)
Restructured cryptographic support no longer depends on libgcrypt (Bernard van der Helm, Roger Bowler, Ivan Warren)
Support emulation of up to 32 CPUs; maximum without special build options now 8 (Ivan Warren)
Enhanced semigraphical control panel now uses all of larger console windows (Greg Smith, David "Fish" Trout)
Many emulation fixes (Roger Bowler, Jan Jaeger, Bernard van der Helm, David "Fish" Trout, Greg Smith, Ivan Warren, Andy Styles, John Decker)
CMPSC fixes now produce identical results with real systems (Jacques Dilbert, Bernard van der Helm)
Integrated 1052-C / 3215-C console support (Jan Jaeger)
tapecopy support for writing as well as reading tapes (Jay Maynard)

Download: hercules-3.03.tar.gz

What's new in Version 3.02

Release date: 11 December 2004

Significant performance improvements (Jan Jaeger, Greg Smith, Gabor Hoffer)
SIE performance almost the same as native (Jan Jaeger, Gabor Hoffer)
SCSI tape support in Windows (David "Fish" Trout)
Mac OS X CTC networking support (Jay Maynard)
Suspend/resume facility (Greg Smith)
ASN-and-LX-Reuse Facility (Roger Bowler)
Enable or disable ASN-and-LX-reuse in config (Jan Jaeger, Ivan Warren)
Extended Translation Facility 3 (Bernard van der Helm)
DAT-enhancement facility (Roger Bowler)
Immediate CCWs now correctly handled when Suppress Incorrect Length Indication is specified (Ivan Warren)
3270 option provided to control connection to group of devices (Ivan Warren)
3270 connections can be limited by IP address (David "Fish" Trout)
Remaining 26 binary floating point instructions (Roger Bowler)
IPL CLear, System Reset, and System Reset Clear operator commands (Ivan Warren)
Pentium 4 optimizations enabled in gcc (Ivan Warren)

Download: hercules-3.02.tar.gz

What's new in Version 3.01

Release date: 30 November 2003

Bypass gcc 2.96 optimizer bug that caused incorrect instruction execution (Ivan Warren)
Added command-line control panel command history (Martin Gasparovic, Volker Bandke)
Message Security Assist (Bernard van der Helm, Jan Jaeger)
Fixed device interrupt pending on IPL that caused OS/360 to have to be IPLed twice (David "Fish" Trout, Greg Smith)
Added pthreads trace function for debugging (Greg Smith)
Fish threads code rewritten, closer to POSIX thread functionality while still performing better (David "Fish" Trout)
Fixed incompatibility with Windows NT telnet client (Greg Price, David "Fish" Trout)
Performance and integrity enhancements for RS instructions (Greg Smith)

Download: hercules-3.01.tar.gz

What's new in Version 3.00

Release date: 2 October 2003

Dynamically loaded module support for devices, instructions, and operator console panels (Jan Jaeger, David "Fish" Trout, Ivan Warren)
Shared and remote DASD support (Greg Smith)
z990 (ALS4) instruction support (Roger Bowler, Jan Jaeger, Bernard van der Helm)
HFP Multiply-Add/Subtract Facility (Roger Bowler)
Long Displacement Facility (Roger Bowler)
Simplified network adapter specifications (David "Fish" Trout, Jim Pierson)
New device emulations: 2703, 3410, 3490, 9347 (Ivan Warren)
ECPS:VM support (Ivan Warren)
Reworked process priority handling (Mark Gaubatz)
Greatly improved interval timer resolution (Mark Gaubatz)
Internal consistency checking improvvements (Greg Smith)
Corrected 3270 session disconnect processing (Ivan Warren)
Instruction disassembler in control panel (Jan Jaeger)
Tape read backward fixes (Jay Jaeger)
Fix for double memory consumption bug on Windows (Mark D., David "Fish" Trout)
OMA tape processing fixes (Ivan Warren)
Message logging restructuring (Jan Jaeger, David "Fish" Trout)
S/370 I/O race condition fixes (Victor Shkamerda, Greg Smith)
Manual pages for some commands (Jim Morrison)

Download: hercules-3.00.tar.gz

What's new in Version 2.17.1

Release date: 12 February 2003

Corrected RPM installed files permissions (John Summerfield)
Corrected dasdload verbosity level (Jay Maynard)
Corrected card reader eof/intrq option handling, added * to designate no file loaded (Jay Maynard)
Correct SLB instruction condition code (Jan Jaeger)
Fix dasdutil.c track conversion function (Jim Morrison)

Download: hercules-2.17.1.tar.gz

What's new in Version 2.17

Release date: 1 February 2003

Restructured DASD subsystem: better use of memory, compressed FBA support, framework for shared DASD (Greg Smith)
New dasdcopy utility replaces ckd2cckd and cckd2ckd, and adds compressed FBA support (Greg Smith)
Native support for Mac OS X 10.2 and above (Paul Scott)
Reworked CTC and LCS emulation (Jim Pierson)
SMP host integrity fixes (Greg Smith and Jan Jaeger)
Fixes for compile errors with gcc 3.x (Greg Smith and David "Fish" Trout)
S/370 dual address space and MVS assist fixes (Jan Jaeger)
Renumbered all messages to consistent format, removed duplicate numbers, and began message documentation (Jay Maynard)
Added options for 1052/3215 consoles and card readers (Jay Maynard)
Numerous instruction and I/O emulation fixes (Greg Smith, Jan Jaeger, Juergen Dobrinski, Bernard van der Helm, Andy Norrie, and David "Fish" Trout)

Download: hercules-2.17.tar.gz

What's new in Version 2.16.5

Release date: 8 July 2002

Correct serious CCKD image file corruption error (Greg Smith)
Allow tape files to be opened for input if on CD-ROM (Volker Bandke)

Download: hercules-2.16.5.tar.gz

What's new in Version 2.16.4

Release date: 3 July 2002

Read backward support for emulated tape (Volker Bandke)
Added 9313, 9332, and 9335 to list of supported devices (Tomas Masek)

Download: hercules-2.16.4.tar.gz

What's new in Version 2.16.3

Release date: 2 July 2002

CTC fix for TurboLinux bug (Jim Pierson)
3287 printer support via TN3270 (Tomas Masek)
S/370 extended memory fixes (Tomas Masek)
ctcadpt.c compilation fix for FreeBSD (Mark Szlaga)
Fixed 3270 ERASE ALL UNPROTECTED command to not count data read (Tomas Fott)
Fixes to ckdtab in dasdtab.c (Greg Smith)
Retrofitted cckd chkdsk fixes/enhancements (Greg Smith)
FBA fixes contributed by Tomas Masek (Greg Smith)
Compatibility fixes for cckd and 2.17 (Greg Smith)

Download: hercules-2.16.3.tar.gz

What's new in Version 2.16.2

Release date: 20 May 2002

Fixed 3350 dasdtab entry (Greg Smith)
Fixed 370 interval timer error (Valery Pogonchenko)
Control panel attach command bug fix (David "Fish" Trout)

Download: hercules-2.16.2.tar.gz

What's new in Version 2.16.1

Release date: 4 May 2002

fthreads locking fixes (David "Fish" Trout)
dasdload bug fix (Greg Smith)
FBA dasd devices allow any size disk (Jay Maynard)
Control panel attach command bug fix (Kris Van Hees)
Windows versions (finally) accessible from main page (Jay Maynard)

Download: hercules-2.16.1.tar.gz

What's new in Version 2.16

Release date: 20 April 2002

PER support (Jan Jaeger, Paul Leisy)
S/370 multiprocessor support (Jan Jaeger)
Licensed software restriction (Jan Jaeger, Jay Maynard)
Performance mods (Gabor Hoffer, Juergen Dobrinski, Greg Smith, and Paul Leisy)
Interrupt subclass priorities (Greg Smith)
dasdcat program (Malcolm Beattie, Roger Bowler)
Updated TCP/IP documentation (Roger Bowler)
CTCI support for Windows (David "Fish" Trout)
Print to unix pipe (Roger Bowler)
Preliminary Lan Channel Station (LCS) support
HTTP server (Jan Jaeger)
Various fixes (as recorded in CHANGES) (Paul Leisy, Matt Zimmerman, Greg Smith, Volker Bandke, Bernard van der Helm, David "Fish" Trout)

Download: hercules-2.16.tar.gz

What's new in Version 2.15

Release date: 04 December 2001

Autoconf added to ease portability (Matt Zimmerman, Fritz Elfert, Willem Konynenberg)
Numerous instruction fixes (Paul Leisy)
TUN/TAP support for Linux kernels beyond 2.4.6 (Matt Zimmerman)
Timer fixes (Greg Smith)
Synchronous I/O (Greg Smith)
Support for IPL from CD-ROMs as with HMC (Jan Jaeger)
CTC hang at shutdown fixed (Jan Jaeger)
CTC TCP/IP now works with VM/ESA (Kris Van Hees)
Compressed CKD endianness and RAS fixes (Greg Smith)
Hot reader support (David "Fish" Trout)
Machine checks now reported for host exceptions, loops, and wait states (Jan Jaeger)

Download: hercules-2.15.tar.gz

(There was no Version 2.14)

What's new in Version 2.13

Release date: 05 July 2001

Restrict TODEPOCH to 1900, 1928, 1960, 1970, or 1988, and correct offset calculation (Michael Koehne)
HET unmount option (Michael Koehne)
quiet command (Michael Koehne)
Panel instruction disassembly (Jan Jaeger)
CMPSC corrections (Bernard van der Helm)
CTCT CTC over TCP/IP (Vic Cross)
Sundry instruction and channel fixes (Jan Jaeger)
Numerous instruction fixes (Paul Leisy)
CKD trace command (Valery Pogonchenko)
Performance enhancements (Juergen Dobrinski)
CGEBR/CGDBR instructions (Jan Jaeger)
CEGBR/CDGBR instructions (Kris Van Hees)
CKD 9345 support (Greg Smith)
Storage Key Assist (Jan Jaeger)
Move Page Facility 2 (Jan Jaeger)

Download: hercules-2.13.tar.gz

What's new in Version 2.12

Release date: 04 May 2001

Numerous instruction fixes (Paul Leisy, Jan Jaeger, Peter Stammbach, Roger Bowler)
FBA and CKD read-only support (Greg Smith)
Enable ISKE/RRBE/SSKE in S/370 mode (Valery Pogonchenko)
CCKD corrections (Greg Smith)
CMPSC fixes for expansion (Greg Smith)
Correct prefix alignment for ESA/390 guest in 64 bit mode SIE (Jan Jaeger)
Card reader multiple files and EBCDIC autopad support
Support for built-in TUN driver of Linux kernel 2.4.x
Device I/O thread throttling (Greg Smith, Fish)
Small optimization of vstore/vfetch and TPI (Jan Jaeger)
Sense/Set Path Group ID for DASD (Jan Jaeger)
Dynamic device threads (Jan Jaeger)
Fast interrupt processing for MCK and PER (Jan Jaeger)
Allow HET files to reside on read-only media (Leland Lucius)
Utilities display versioning and copyright info (Greg Smith)
Present device end on terminating console session (Jan Jaeger)
sh panel command (Bernard van der Helm)
9221 power-off diagnose (Jan Jaeger)
Debug format enhancements (Peter Stammbach)
Fix for device threads (Juergen Dobrinski)
Sundry new ESAME instructions and corrections (Roger Bowler, Jan Jaeger)
Improved interrupt processing (Valery Pogonchenko)
Incorrect-Length-Indication-Suppression facility (Jan Jaeger)
S/370 interval timer fixes (Mark Gaubatz)
64-bit Interpretive Execution (Jan Jaeger)
IEEE floating point (Willem Konynenberg)
64-bit panel updates (Roger Bowler)
LPM fixes and display subchannel command (Nobumichi Kozawa)
Fix amode64 in load_psw (Ulrich Weigand)
Multiply Logical instructions (Vic Cross)
Environment variables to override filenames of hercules.rc hercules.cnf and hercifc (Jan Jaeger)
Floating point enhancements (Roger Bowler, Jan Jaeger)
Country codepage tables (Roger Bowler)

Download: hercules-2.12.tar.gz

What's new in Version 2.11

Release date: 09 February 2001

Sundry new ESAME instructions and corrections (Jan Jaeger)
Panel display instruction operands (Roger Bowler)
TRAP and RP instructions (Jan Jaeger)
TP instruction (Roger Bowler)
Tape data chaining patch (Brandon Hill)
Bypass Cygwin stack problem (Greg Smith)
Fixes for Windows port (Volker Bandke)
SSK/ISK/RRB fix for 2K storage keys (Valery Pogonchenko, Jan Jaeger)
Extended Translation Facility 2 (Roger Bowler)
Divide Logical instructions (Vic Cross)

Download: hercules-2.11.tar.gz

What's new in Version 2.10

Release date: 02 February 2001

z/Architecture support (Jan Jaeger)
TUN/TAP support for CTC (Roger Bowler)
OSTAILOR VSE option (Roger Bowler)
2K/4K storage key support (Jan Jaeger)
Fully functional CMPSC instruction (Bernard van der Helm)
Fix read-only AWSTAPE (Roger Bowler)
Sundry new ESAME instructions (Jan Jaeger, Roger Bowler)
Format-2 2K/4K IDAW (Roger Bowler)
ESAME 5-level DAT (Roger Bowler)
ESAME ASN authorization and ALET translation (Roger Bowler)
ESAME linkage-stack instructions (Roger Bowler)
ESAME subspace replacement (Roger Bowler)
ESAME DUCT format changes (Roger Bowler)
Unloaded tape drive support (Brandon Hill)
Extended floating point (Peter Kuschnerus)
Divide Single instructions (Jan Jaeger)
EPSW instruction (Roger Bowler)
Compressed CKD updates (Greg Smith)
Timer update correction (Valery Pogonchenko)
Fix MVCLE instruction (Jan Jaeger)
Interval Timer fix (Bob Abeles)

Download: hercules-2.10.tar.gz

What's new in Version 1.71

Release date: 18 January 2001

Compressed CKD DASD support release 2, with improved performance, shadow file support, and better reliability (Greg Smith)
Hercules Emulated Tape format support (Leland Lucius)
Make HET bzip2 compression optional, analogous to CCKD bzip2 (Jay Maynard)
Fix for track overflow record zeroing (Roger Bowler)
Clarified licensing discussion in FAQ (Roger Bowler)
Treat printer X'37' CCW as NOP (Jay Maynard, suggested by Brandon Hill)
Treat X'E503' MVS/XA assist instruction as no-op (Jay Maynard, suggested by Brandon Hill)
Read commands from hercules.rc at startup (Willem Konynenberg)
New tapelist program prints contents of 80-byte record tapes (Jim Morrison)
Increased MAXDBLK from 3000 to 40000 and MAXTTR from 10000 to 40000 in dasdload (Volker Bandke)

Download: hercules-1.71.tar.gz

What's new in Version 1.70

Release date: 3 December 2000

New file hercwin32.zip contains build scripts for Win32 version (Volker Bandke)
More performance enhancements (Juergen Dobrinski)
ALS-1 and ALS-2 support completion (Roger Bowler and Jan Jaeger)
Extended Translation Facility (Roger Bowler)
Pick up correct float.c module (Jay Maynard for Peter Kuschnerus)
Distribute Windows binaries as well as Linux (Jay Maynard)
Fix orienting bug in CKD DASD search CCW processing (Bob Abeles)
Obtain TOD clock lock when accessing or updating 370 interval timer (Bob Abeles)
Change license to the QPL Open Source Definition-compliant license (Roger Bowler, Jay Maynard, and Jan Jaeger)

Download: hercules-1.70.tar.gz

What's new in Version 1.69

Release date: 29 October 2000

Correct AXR and SXR instruction results when significance exception raised (Peter Kuschnerus, with help from Mario Bezzi)
Correct CD and CDR instruction condition code logic (Peter Kuschnerus)
Do not generate support for square root instructions in 370 mode (Peter Kuschnerus)
Floating point arithmetic tuning (Peter Kuschnerus)
Performance optimization fixes (Juergen Dobrinski)
Spelling corrections (Adam Thornton)
Fixed version number (Jay Maynard)

Download: hercules-1.69.tar.gz

What's new in Version 1.68

Release date: 8 October 2000

Rewritten and updated FAQ (Dave Morton)
Compressed CKD DASD support (Greg Smith)
Many performance improvements (Juergen Dobrinski, with help from Albert Louw and Valery Pogonchenko)
DASD I/O optimizations (Greg Smith and Malcolm Beattie)
Simplified building on non-Intel architectures (Jay Maynard)
Fix for random bug in MP instruction (Mario Bezzi)
Treat all 3505 card reader read CCWs the same (Jay Maynard)

Download: hercules-1.68.tar.gz

What's new in Version 1.67

Release date: 4 September 2000

Win32 portability changes (John Kozak)
Fix for 64K segment length checking in 370 DAT (Jay Maynard, found by Mario Bezzi)
Fix for TPI storing interrupt code when no interrupt pending (Jay Maynard, found by Greg Smith)
Skip to channel 9 and 12 support (Roger Bowler)
Panel refresh rate speedup and command (Reed Petty)
Fix storage protection override on fetch (Jan Jaeger)
SIE support, with S/370 and ESA/390 modes and vector support (Jan Jaeger)
Bugfix for MXR instruction (by Peter Kuschnerus)
CONCS, DISCS and RCHP instructions (Jan Jaeger)
Fix flags on intermediate subchannel status (Jan Jaeger)
Break SYSCONS output lines when too long (Jan Jaeger)
Floating point instructions SQDR and SQER (by Peter Kuschnerus)
Lock Page instruction (Jan Jaeger)

Download: hercules-1.67.tar.gz

What's new in Version 1.66

Release date: 3 August 2000

Simplify logmsg and DEVTRACE macro definitions (Jay Maynard)
Prevent incorrect length indication on CONTROL NOP CCW (Jay Maynard)
Complete 370 HIO processing (Jay Maynard)
Correct nullification of TPI and TSCH (Jan Jaeger)
Add device locking to MSCH (Jan Jaeger)
Correct TPROT instruction (Jan Jaeger)
Correct address wrapping on assist instructions (Jan Jaeger)
Change interrupt logic to use longjmp on all interrupts (Jan Jaeger)
Clear remainder of ASTE when loading ASTE with ASF=0 in translate_asn (Jan Jaeger)
Add (incomplete) PLO instruction (Jan Jaeger)
Fix CLCL interruption problem (Jan Jaeger)
Fix addresswrap in MVO (Jan Jaeger)
Make ED and EDMK perform a trial run (Jan Jaeger)
Fix address wraparound in MVO (Jan Jaeger)
Fix CR15 corruption in form_stack_entry, fix nullification in form_stack_entry and unstack_registers (Jan Jaeger)
Fix loss of interrupts in PR (Jan Jaeger)

Download: hercules-1.66.tar.gz

What's new in Version 1.65

Release date: 22 July 2000

Track overflow processing fixes (by Jay Maynard, suggested by Valery Pogonchenko)
Added TOD clock update to STCK, STCKE, DIAG 204, and TRACE processing (by Jay Maynard)
Fixed READ DEVICE CHARACTERISTICS alternate track values for 3380 and 3390 (by Peter Macdonald)
Skeletal CMPSC instruction (by Bernard van der Helm)
Added support for 3340 and 3375 DASD (by Jay Maynard, with help from Rick Fochtman and David Cole)
Corrected interval timer update increment (by Jay Maynard)
float.c optimization for new instruction decode and execution (by Peter Kuschnerus)
Fix program check on TIC ccw (by Jan Jaeger)
Fix program check on NOP ccw (by Jan Jaeger)
Instruction decode & execution restructure (by Jan Jaeger)
Added -fomit-frame-pointer to compiles for improved performance (by Jan Jaeger)
Fix STCKE instruction (by Bernard van der Helm)

Download: hercules-1.65.tar.gz

What's new in Version 1.64

Release date: 4 July 2000

Added track overflow processing for CKD DASD (by Jay Maynard)
Makefile change to allow RPM building with RPM_BUILD_ROOT (by David Barth)
Added NetBSD build definitions to makefile (by Soren Jorvang)
Moved version definition to version.h and removed makefile dependency for source modules (by Jay Maynard)
Package change: tarball now explodes into hercules-<version> subdirectory (by Jay Maynard, suggested by Soren Jorvang)
Fix backward going TOD clock (by Jan Jaeger)
Suppress superflous HHC701/HHC702 messages (by Jan Jaeger)
Rework cpu.c to decode instructions by macro (by Jan Jaeger)
Bypass bug in IBM telnet client (by Jan Jaeger)

Download: hercules-1.64.tar.gz

What's new in Version 1.63

Release date: 18 June 2000

3270 CCW processing improvements (by Jan Jaeger)
OSTAILOR generalization, and new pgmtrace panel command (by Jan Jaeger)
VM IUCV instruction correction and DIAGNOSE improvements (by Jan Jaeger)
CPU timer and clock comparator improvements (by Jan Jaeger, after a suggestion by Willem Konynenberg)
3480 READ BLOCK ID and LOCATE CCW support (by Brandon Hill)
Networking support via virtual CTCA (by Willem Konynenberg)
Restructured CPU execution, by function call instead of switch statement (by Mike Noel)
Support for IEBCOPY sequential output datasets in dasdload (by Ronen Tzur)
New dasdls command lists the VTOC of a CKD DASD volume (by Malcolm Beattie)
New AWSTAPE handling commands: tapesplt, tapemap (by Jay Maynard)
make install target to install in /usr/bin (by Jay Maynard)

Download: hercules-1.63.tar.gz

What's new in Version 1.62

Release date: 3 June 2000

Still more multiprocessor improvements (by Jan Jaeger)
Dynamic CPU reconfiguration (by Jan Jaeger)
Basic vector facility (by Jan Jaeger)
Floating point version 6 (by Peter Kuschnerus)
READ AND RESET BUFFERED LOG CCW (X'A4') support (by Jay Maynard)
WRITE SPECIAL CKD CCW (X'01') support (by Jay Maynard)
FBA DASD model reporting fixes (by Jay Maynard)

Download: hercules-1.62.tar.gz

What's new in Version 1.61

Release date: 21 May 2000

More multiprocessor improvements (by Jan Jaeger)
New startall/stopall panel commands (by Jan Jaeger)
STIDP stores processor address in first digit of CPU id (by Roger Bowler)
Correction to IPTE instruction for S/370 (by Jay Maynard)
Dummy HIO instruction for S/370 (by Jay Maynard)
Support for emulated 0671 FBA DASD (by Jay Maynard)
FBA device reserve/release CCW support (by Jay Maynard)
New OSTAILOR configuration option allows selective suppression of program check messages (by Jay Maynard)

Download: hercules-1.61.tar.gz

What's new in Version 1.60

Release date: 14 May 2000

Multiprocessor locking improvements (by Jan Jaeger)
Machine check and channel report word (by Jan Jaeger)
Store Channel Report Word (STCRW) instruction (by Jan Jaeger)
New attach/detach/define commands to allow dynamic addition and deletion of devices from the configuration (by Jan Jaeger)
Compare and Swap and Purge (CSP) instruction (by Jan Jaeger)
Broadcasted purging (by Jan Jaeger)
Fix LASP instruction SASN authorization using wrong AX if bits 29-31 are 010 and SASN \= PASN (by Mario Bezzi)
Fix SAC instruction special operation exception setting secondary space mode when ASF=0 (by Mario Bezzi)
Remove intdrag option and replace drag command by toddrag command
New extpending flag to improve performance (originally contributed by Valery Pogonchenko and enhanced by Jan Jaeger)
Allow longer host name in console connected message (by Jay Maynard)
Floating point version 5 including fixes by Mario Bezzi (contributed by Peter Kuschnerus)

Download: hercules-1.60.tar.gz

What's new in Version 1.59

Release date: 30 Apr 2000

Missing interrupt after CSCH instruction
S/370 DAT support (contributed by Jay Maynard)
Tape device sense byte improvements (by Jan Jaeger)
Read Buffered Log (CCW X'24') for tape devices (by Jan Jaeger)
Reject Sense ID CCW for 3420 tape devices (by Jan Jaeger)
Suppress unprintable character in HMC messages (by Jan Jaeger)
Suppress attention interrupt if subchannel not enabled (by Roger Bowler)
New interrupt drag factor to improve performance (by Roger Bowler)
New toddrag and intdrag config options and drag control panel command allow drag factors to be set (by Roger Bowler)
Light optimization on CPU critical path (by Valery Pogonchenko)
Eliminate fetch protection override in S/370 mode (by Valery Pogonchenko)

What's new in Version 1.58

Release date: 22 Apr 2000

Support for CKD DASD volumes exceeding 2GB such as 3390-3 (by Roger Bowler)
3274-1D SELECT RB/RMP/RBP/WRT commands (by Roger Bowler)
Support for 3270 14-bit SBA addressing and inbound SFE order (by Roger Bowler)
Command reject if Write Structured Field CCW issued to a 3270 without extended attributes (by Roger Bowler)
Fix missing CSW_IL indication when CCW count exhausted (by Roger Bowler)
Do not set unit exception if CCW count is zero (by Jan Jaeger)
Suppress space switch event program check messages (by Jan Jaeger)
Branch tracing and cross memory tracing for BALR, BASR, BASSM, BAKR, BSA, BSG, SSAR, PC, PT, PR instructions (by Jan Jaeger)
New diagnose instruction to stop CPU (by Jan Jaeger)
Drag factor option slows down TOD clock, to decrease overhead on very slow machines (by Jan Jaeger)
Correction to PR instruction (by Jan Jaeger)
Correction to LASP instruction (by Jan Jaeger)
Make CLCLE/MVCLE/CKSM instructions conditional features (by Jan Jaeger)
Enable channel measurement mode (by Jan Jaeger)
Modify program_check() to handle shadow registers correctly (by Jan Jaeger)
Change DAT to favour PSTD in TEA, to give reduction in page fault path length (by Jan Jaeger)
Avoid clearing registers at CPU reset (by Jan Jaeger)
Leave GPR, AR and FPR intact during CPU reset for SADUMP (by Jan Jaeger)
Zeroize field for called space identification in PC stack entry (by Jan Jaeger)
New CCW X'8D' (Write Update Key and Data) required by STOW (by Jan Jaeger)
Fix for 0B7 abend in D M=CHP command (by Jan Jaeger)
Floating point version 4 including fixes by Valery Pogonchenko (contributed by Peter Kuschnerus)
Fix incorrect second operand address in MVCIN instruction (by Roger Bowler)
Correct sign of zero result in SRP instruction (by Roger Bowler)
Erase Gap (CCW X'17') for tape devices (by Roger Bowler)
Activate MIPS counter on control panel (by Dutch Owen)
Suppress tracing of ISK, SCK, and DP instructions

What's new in Version 1.57

Release date: 30 Mar 2000

Fix program check 0032 due to wrong stack entry being updated
Fix wrong SSTD loaded by LASP instruction (found by Jan Jaeger)
Bypass main storage lock in single CP configuration (by Jan Jaeger)
Fix incorrect condition code in PGIN instruction (by Jan Jaeger)
Corrections to expanded storage instructions (by Jan Jaeger)
New STCPS and SCHM instructions (by Jan Jaeger)
Set more appropriate sense bytes for tape errors

What's new in Version 1.56

Release date: 28 Mar 2000

Fix incorrect unit exception on SCSI tape FSB/BSB CCW (reported by Daniel Rudin)
Fix unit check on AWSTAPE write (reported by Axel Schwarzer)
Close SCSI tape after tape is ejected
Detect tapemark during SCSI tape FSB/BSB CCW
Suppress HMC response prompt (by Jan Jaeger)
Expanded storage support (by Jan Jaeger)
Move Page Facility 2
Correct signed length error in MVCK/MVCS/MVCP (by Jan Jaeger)
Undetected CC=3 in SRP instruction
Wrong remainder in DP instruction when dividend is less than divisor
Specification exception in DP instruction should have higher priority than data exception

What's new in Version 1.55

Release date: 22 Mar 2000

FBA minidisk support
Additional diagnose functions
Allow real storage frames to be marked unusable (by Jan Jaeger)

What's new in Version 1.54

Release date: 18 Mar 2000

Address wraparound improvement (contributed by Jan Jaeger)
Floating point version 3 (contributed by Peter Kuschnerus)
Correction to SLDA/SRA instructions (contributed by Jan Jaeger)
Recognize tabs and end-of-file character in ASCII cardrdr files
Hercules-specific diagnose instructions (contributed by Jay Maynard)
Correct missing timer interrupt when interval timer goes from zero to negative (thanks to Valery Pogonchenko)
Enable HMC system console in S/370 mode
Correct sign propagation in multiply instruction
Reduce CPU thread priority (thanks to Steve Gay and Reed H.Petty)

What's new in Version 1.53

Release date: 01 Mar 2000

Add BSF/FSF/BSB/FSB CCW support for tape devices
Allow final short block in OMA fixed block files
Allow processing of read-only AWSTAPE files and SCSI tapes
Skeleton ctcadpt module for future 3088 support
Correctly nullify IC/NI/OI/XI/CLM/STCM/ICM/TRT instructions on page translation exception (thanks to Jan Jaeger)
Improved floating point support (contributed by Peter Kuschnerus)
Correct shift result when shift count exceeds 31 (thanks to Glen Herrmannsfeldt and Jay Maynard)
Fix incorrect MVCL cc=3 when destination length is 1

What's new in Version 1.52

Release date: 19 Feb 2000

Prevent incorrect length indication on 3270 Select CCW
2K storage protection for S/370
Prevent wait for console port (thanks to Malcolm Beattie)
Allow keyword parameters in configuration file
New sysepoch and tzoffset parameters (thanks to Jay Maynard)
Adjust TRACE and DIAG204 for extended TOD (thanks to Jan Jaeger)
Set TOD clock in SCK instruction (thanks to Jan Jaeger)

What's new in Version 1.51

Release date: 15 Feb 2000

3270 read buffer fix for OS/360 NIP
Floating point instructions (contributed by Peter Kuschnerus)
Remove 32-bit pointer dependency from dasdload for Alpha
HMC system console support (contributed by Jan Jaeger)
Correct condition code after decimal overflow (thanks to Jan Jaeger)
Set reference and change bits for PSA access (thanks to Jan Jaeger)
New CRLF option for printer and card punch (default is now LF)

What's new in Version 1.50

Release date: 10 Feb 2000

Remove interval timer debugging message
Fix hung console resulting from attention interrupt fix in 1.49
Seek and Set Sector (CCW=27) for Itel 7330 DASD controller
Correct SIGP handling of non-existent CPUs (thanks to Jan Jaeger)
Extended TOD clock bit in processor features (thanks to Jan Jaeger)
Alternate control panel help text (contributed by Dutch Owen)
Card reader end of file option (thanks to Dutch Owen)
Card reader ASCII/EBCDIC auto-detection
Fix SIGP RESTART to target correct CPU (thanks to Jan Jaeger)
Allow VTOC size and location to be specified for dasdload.

What's new in Version 1.49

Release date: 05 Feb 2000

Alternate control panel (contributed by Dutch Owen)
Present attention interrupt when console connects
Fix dasdload CVOL logic (thanks to Jay Maynard)
Fix dasdload initialization of empty PDS
Allow device size to be specified for dasdload Note: the volser record in the pack layout file must be changed to specify the device type and cylinder count; the device type is no longer specified on the command line.
Add dummy Set Clock instruction (does nothing except set cc 0)

What's new in Version 1.48

Release date: 31 Jan 2000

Fix dasdload to handle note lists (prevent 32D abend)
I/O interrupt performance enhancement
Correctly detect overflow in signed Add/Subtract instructions
Fix track overflow problem
3270 Read Modified CCW

What's new in Version 1.47

Release date: 23 Jan 2000

Allow tn3270 or telnet client to connect to specific device number
Align control panel instruction counter (thanks to Mario Bezzi)
Ensure panel display does not corrupt TEA (by Jan Jaeger)
STIDP incorrectly propagates high order bit of CPU model (fixed by Jan Jaeger)
Fix byte-ordering problem with CKD DASD header on non-Intel machines (reported by Adam Thornton)
STIDC instruction
Extended TOD clock (STCKE and SCKPF instructions)
3211 Load FCB and Diagnostic Read CCW
3270 Read Buffer CCW
Fix console.c to inhibit input while console has status pending

What's new in Version 1.46

Release date: 11 Jan 2000

HSCH instruction
SIGP instruction
Suppress tracing of page faults
Display control registers and access registers after program check
Add regs parameter to program_check function calls
New panel command to perform store status function
Suppress tracing of CCW file protect and end of cylinder errors

What's new in Version 1.45

Release date: 08 Jan 2000

Make MVCL/CLCL interruptible (contributed by Jan Jaeger)
Diagnose 204 (contributed by Jan Jaeger)
Read Channel Subsystem Info (contributed by Jan Jaeger)
Fix incorrect register count in TRACE instruction
Correct nullification of STM/LM/LAM/STAM/STCTL/LCTL/STCM and SS instructions whose operands cross a page boundary
Suppression on Protection with Virtual-Address enhancement
Select correct address space for MVCS/MVCP (fixed by Jan Jaeger)
Correct registers after CLCL/CLCLE with non-zero condition code
Defer clock comparator interrupt while instruction stepping
Remove 32K limit on data chained write CCWs for non-CKD devices
Correct overrun error on data chained write for FBA DASD

What's new in Version 1.44

Release date: 01 Jan 2000

Support for 9336 FBA DASD
Read Replicated Data command for FBA DASD
Prevent recursive program check after instruction fetch error
Operand tracing for MVCL/CLCL and RRE instructions

What's new in Version 1.43

Release date: 27 Dec 1999

New control panel command: devlist
Write Update Data (X'85') CCW for CKD devices
Makefile changed to use $(CC) instead of cc
Fix dat.c to prevent ASN translation specification exception (program check X'0017') if subspace group facility is installed and ASF is one
Fix cpu.c to clear ILC before fetching instruction to prevent PSW being backed up if access error occurs during instruction fetch
Correct program check ILC when instruction is nullified
Obtain CPU model number for STIDP from configuration file (contributed by Jay Maynard) Note: if upgrading from an earlier release, you must change your hercules.cnf file to add a valid CPU model number after the CPU serial number
Prevent wait after devinit (thanks to Jay Maynard)
Open printer with O_SYNC to ensure buffers flushed (suggested by Daniel Seagraves)
Fix xmem.c to prevent loop in program_call when loading 4-word ETE (thanks to Jan Jaeger)
Improved TLB lookup (contributed by Jan Jaeger)

What's new in Version 1.42

Release date: 16 Dec 1999

New makefile builds both S/370 and ESA/390 executables: hercules-370 and hercules-390 (contributed by Jay Maynard)
3480 Set Path Group Id and Unassign CCWs (contributed by Jan Jaeger)
CFC and UPT instructions (contributed by Peter Kuschnerus)
Card punch support
Erase (X'11') CCW for CKD devices
Correct setting of translation exception address
Correct file mode when opening printer file
Correct condition code for shift arithmetic instructions

What's new in Version 1.41

Release date: 07 Dec 1999

Set reference and change bits correctly for main storage accesses by channel, dat, xmem, stack, block, and service modules (thanks to Jan Jaeger)
New devinit command (contributed by Jay Maynard)
Reject control panel virtual storage display command if CR1=0
Fix dasdload to correctly write EOF record for empty file and to correctly fill block overhead fields in format4 DSCB.
Diagnose functions MSSFCALL and SCPEND (contributed by Jan Jaeger)
Corrections to service.c and assist.c (contributed by Jan Jaeger)
Alpha platform portability definitions (contributed by Jay Maynard)
3480 Assign CCW (thanks to Rick McKelvy)

What's new in Version 1.40

Release date: 30 Nov 1999

New DASDISUP program performs OS/360 IEHIOSUP function
Correct SCSW handling for suspend/resume
Forward space file CCW for tape devices
3480 load display CCW (contributed by Jan Jaeger) and sense path group id CCW (thanks to Rick McKelvy)
Correct handling of OMA tape headers to correctly recognize tape mark and to align headers to 16-byte boundary
EBCDIC character translation of CCW data displays
Fix command reject for CKD read commands outside the domain of a locate record

What's new in Version 1.39

Release date: 24 Nov 1999

Concurrent sense
I/O initial status interruption
Channel program suspend/resume function and RSCH instruction
Read Device Characteristics CCW for 3480
Fix incorrect command reject on Sense Subsystem Status CCW
Increase 3270 write buffer size to prevent console I/O error when using Zap function of ZZSA
Fix very nasty error in dat.c causing wrong bytes to be fetched or stored when operand crosses page boundary
Remove temporary fix to ckddasd.c introduced in 1.37

What's new in Version 1.38

Release date: 22 Nov 1999

New panel commands to allow storage alteration
Fix incorrect I/O parameter on attention interrupt (thanks to Jan Jaeger for reporting this bug)
Clear PMCW correctly during I/O reset
Change 3270 control unit type to 3274-1D
Fix restart command broken by 1.37

What's new in Version 1.37

Release date: 19 Nov 1999

Storage range display
EBCDIC character translation of storage displays
New breakpoint command (contributed by Dan Horak)
Messages go to log file as well as screen if stdout is redirected
Fix missing interrupt caused by channel.c failing to obtain device lock before setting interrupt pending
Fix incorrect cond code 1 in attention SCSW built by console.c
New Read Channel Path Information service call
Temporary fix to ckddasd.c multitrack search
Addition of Read Device Characteristics and Sense Subsystem Status commands for CKD devices
New DASDPDSU program to unload PDS members from a CKD volume

What's new in Version 1.36

Release date: 12 Nov 1999

Clear subchannel instruction
Correct fault causing control panel display corruption

What's new in Version 1.35

Release date: 09 Nov 1999

Improved control panel user interface
New control panel commands: start, stop, restart, ipl, loadparm
New loadcore command to load disk image files
S/370 interval timer
Allow 31-bit mode linkage in lock instructions
Support for PCI in ESA/390 mode as well as S/370 mode
Correct problem causing false channel protection checks

What's new in Version 1.34

Release date: 29 Oct 1999

New DASDLOAD program to create a CKD volume from unloaded PDS files
Correct CKD module to prevent record not found error on multitrack Read Count CCW

What's new in Version 1.33

Release date: 26 Oct 1999

Write support for SCSI tapes and AWSTAPE files
Correct handling of REWIND command for AWSTAPE files
Correct nasty bug in Subtract Logical instruction (thanks to Roland Goetschi for finding this bug)
Ensure unique TOD clock values for Store Clock
Correction to unstacking process for PR instruction
Implementation of Read Multiple CKD command

What's new in Version 1.32

Release date: 18 Oct 1999

Support for virtual tapes in OMA (Optical Media Attach) format
SCSI tape support (read-only)
Minor corrections to CKD DASD support

If you have a question about Hercules, see the Hercules Frequently-Asked Questions page.