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The Computer History Simulation Project
C C++ Batchfile Makefile Module Management System Objective-C Other
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ALTAIR ALTAIR, Interdata, LGP, NOVA: Addition of sim_printf in various place…
AltairZ80 AltairZ80: Reduced polling for CPU stop on non UNIX platforms
BESM6 SCP: Added the capability for EXAMINE command output to be written di…
GRI All: Convert from C runtime library perror() to sim_perror so that al…
H316 ALL: Merge with Supnik-Current
HP2100 SCP: Added the capability for EXAMINE command output to be written di…
I1401 All: Convert from C runtime library perror() to sim_perror so that al…
I1620 I1620: Added missing TFL instruction (Tom McBride)
I7094 All: Convert from C runtime library perror() to sim_perror so that al…
Ibm1130 All: Convert from C runtime library perror() to sim_perror so that al…
Intel-Systems ISYS8010, ISYS8020: Fix file name case inconsistencies
Interdata All: Convert from C runtime library perror() to sim_perror so that al…
LGP All: Convert from C runtime library perror() to sim_perror so that al…
NOVA All: Convert from C runtime library perror() to sim_perror so that al…
PDP1 All: Convert from C runtime library perror() to sim_perror so that al…
PDP10 PDP10: Added DEUNA/DELUA support back since there exists software whi…
PDP11 PDP10, PDP11, VAX, MUX: Fix allowed line attach syntax to accept UDP …
PDP18B All: Convert from C runtime library perror() to sim_perror so that al…
PDP8 All: Convert from C runtime library perror() to sim_perror so that al…
PDQ-3 SCP: Added the capability for EXAMINE command output to be written di…
S3 All: Convert from C runtime library perror() to sim_perror so that al…
SAGE All: Convert from C runtime library perror() to sim_perror so that al…
SDS All: Convert from C runtime library perror() to sim_perror so that al…
SSEM SCP: Added the capability for EXAMINE command output to be written di…
TX-0 All: Convert from C runtime library perror() to sim_perror so that al…
VAX ALL: Merge with Supnik-Current
Visual Studio Projects ISYS8020: Add Visual Studio Project for isys8020 simulator
alpha ALPHA, ALTAIR, AltairZ80, I7094, NOVA, PDP1, PDP10, PDP11, PDP18B, PD…
display ALPHA, ALTAIR, AltairZ80, I7094, NOVA, PDP1, PDP10, PDP11, PDP18B, PD…
doc TAPES: Attempt to validate the record structure of TPC formatted tape…
frontpanel FRONTPANEL: Added support for a register array to be returned as part…
sigma SIGMA: Merge updates from Bob Supnik
swtp6800 SWTP6800: Adjust indentation
.gitattributes Beta Simulators (PDQ-3 and SAGE) from Holger Veit
.gitignore GIT: Added ignore of OS/X DS_Store files and made line endings consis…
0readmeAsynchIO.txt Merge branch 'master' into AsyncTmxr
0readme_39.txt SCP: Added debugging support for EXPECT and SEND activities. Fixed SE…
0readme_ethernet.txt Visual Studio Projects: Added download path for Visual Studio 2008 SP1
README.md README: Update to describe packet throttling option for XQ & XU ether…
build_mingw.bat makefile: Simpler build under MinGW. Detect attempt to build under Ms…
build_mingw_ether.bat ETHER: Remove support for statically linking libpcap on Linux and OS …
build_mingw_noasync.bat makefile: Simpler build under MinGW. Detect attempt to build under Ms…
descrip.mms PDP10: Added DEUNA/DELUA support back since there exists software whi…
helpx SCP: Added hierarchical help capability (from Timothe Litt)
makefile ISYS8020: Makefile correction to build correctly
scp.c SCP: More immediate detection of changed stop_cpu during event proces…
scp.h FRONTPANEL: Added mount and dismount commands for removable media
scp_help.h SCP: Added hierarchical help capability (from Timothe Litt)
sim_BuildROMs.c PDP10, PDP11, VAX: const cleanup
sim_console.c FRONTPANEL: Added mount and dismount commands for removable media
sim_console.h FRONTPANEL: Added mount and dismount commands for removable media
sim_defs.h SCP: Added automatic saving of console WRU, DEL, BRK and PCHAR consol…
sim_disk.c SCP: Fix dangling perror details
sim_disk.h PDP10, PDP11, VAX: const cleanup
sim_ether.c PDP10, PDP11, VAX: const cleanup
sim_ether.h PDP10, PDP11, VAX: const cleanup
sim_fio.c makefile: dynamically determine if shm_open is available on the local…
sim_fio.h SCP: Added generic primitives to create named shared memory regions w…
sim_frontpanel.c FRONTPANEL: Added support for a register array to be returned as part…
sim_frontpanel.h FRONTPANEL: Added support for a register array to be returned as part…
sim_imd.c AltairZ80: Promote sim_imd.c to a top level simh library to be used a…
sim_imd.h AltairZ80: Promote sim_imd.c to a top level simh library to be used a…
sim_rev.h Remove stray tab characters which crept in over time
sim_serial.c PDP10, PDP11, VAX: const cleanup
sim_serial.h Fix to build on HPUX with the HP C compiler which doesn't define __unix
sim_sock.c SOCKETS: Suppress expected read error message on close of a blocking …
sim_sock.h SOCKETS: Fixed commit e69c3ad to also work on non Windows platforms
sim_tape.c TAPES: Attempt to validate the record structure of TPC formatted tape…
sim_tape.h TAPES: Attempt to validate the record structure of TPC formatted tape…
sim_timer.c SCP: Added automatic saving of console WRU, DEL, BRK and PCHAR consol…
sim_timer.h SCP: Restructured timer/co-scheduling activities to support co-schedu…
sim_tmxr.c PDP10, PDP11, VAX, MUX: Fix allowed line attach syntax to accept UDP …
sim_tmxr.h SCP: Added the capability for EXAMINE command output to be written di…
sim_video.c VIDEO: Fix building of video capable simulators on host systems which…
sim_video.h VIDEO: Fix video capable simulator builds on platforms which don't ha…

README.md

SIMH v4.0 - Beta

WHAT'S NEW

New Simulators

Leonid Broukhis and Serge Vakulenko have implemented a simulator for the Soviet mainframe BESM-6 computer.

Matt Burke has implemented new VAX model simulators:

VAX/11 730
VAX/11 750
VAX 8600/8650
MicroVAX I & VAXStation I
MicroVAX II & VAXStation II
rtVAX 1000 (or Industrial VAX 620)

Howard Harte has implemented a Lincoln Labs TX-0 simulator.

Gerardo Ospina has implemented a Manchester University SSEM (Small Scale Experimental Machine) simulator.

Updated AltairZ80 simulator from Peter Schorn.

Updated HP2100 simulator from Dave Bryan.

Beta Sigma 5, 6 & 7 simulator from Bob Supnik

Beta SAGE-II and PDQ-3 simulators from Holger Veit

New Host Platform support - HP-UX and AIX

Simulator Front Panel API

The sim_frontpanel API provides a programatic interface to start and control any simulator without any special additions to the simulator code.

New Functionality

Remote Console Facility

A new capability has been added which allows a TELNET Connection to a user designated port so that some out of band commands can be entered to manipulate and/or adjust a running simulator. The commands which enable and control this capability are SET REMOTE TELNET=port, SET REMOTE CONNECTIONS=n, SET REMOTE TIMEOUT=seconds, and SHOW REMOTE.

The remote console facility has two modes of operation: 1) single command mode. and 2) multiple command mode.
In single command mode you enter one command at a time and aren't concerned about what the simulated system is doing while you enter that command. The command is executed once you've hit return. In multiple command mode you initiate your activities by entering the WRU character (usually ^E). This will suspend the current simulator execution. You then enter commands as needed and when you are done you enter a CONTINUE command. While entering Multiple Command commands, if you fail to enter a complete command before the timeout (specified by "SET REMOTE TIMEOUT=seconds"), a CONTINUE command is automatically processed and simulation proceeds.

A subset of normal simh commands are available for use in remote console sessions. The Single Command Mode commands are: ATTACH, DETACH, PWD, SHOW, DIR, LS, ECHO, HELP The Multiple Command Mode commands are: EXAMINE, IEXAMINE, DEPOSIT, EVALUATE, ATTACH, DETACH, ASSIGN, DEASSIGN, STEP, CONTINUE, PWD, SAVE, SET, SHOW, DIR, LS, ECHO, HELP

A remote console session will close when an EOF character is entered (i.e. ^D or ^Z).

VAX/PDP11 Enhancements

RQ has new disk types: RC25, RCF25, RA80
RQ device has a settable controller type (RQDX3, UDA50, KLESI, RUX50)
RQ disks default to Autosize without regard to disk type
RQ disks on PDP11 can have RAUSER size beyond 2GB
DMC11/DMR11 DDCMP DECnet device simulation.  Up to 8 DMC devices are supported.  Packet transport is via TCP or UDP connections.
KDP11 on PDP11 for DECnet
DUP11 on PDP11 for DECnet connectivity to talk to DMC, KDP or other DUP devices
DZ on Unibus systems can have up to 256 ports (default of 32), on 
    Qbus systems 128 port limit (default of 16).
DZ devices optionally support full modem control (and port speed settings 
    when connected to serial ports).
DHU11 (device VH) on Unibus systems now has 16 ports per multiplexer.
XQ devices (DEQNA, DELQA and DELQA-T) are bootable on Qbus PDP11 simulators
XQ and XU devices (DEQNA, DELQA, DELQA-T, DEUNA and DELQA) devices can now 
    directly communicate to a remote device via UDP (i.e. a built-in HECnet bridge).
XQ and XU devices (DEQNA, DELQA, DELQA-T, DEUNA and DELQA) devices can now 
    optionally throttle outgoing packets which is useful when communicating with
    legacy systems on a local LAN which can easily get over run when packets
    arrive too fast.
MicroVAX 3900 has QVSS (VCB01) board available.
MicroVAX 3900 and MicroVAX II have SET CPU AUTOBOOT option
MicroVAX 3900 has a SET CPU MODEL=(MicroVAX|VAXServer|VAXStation) command to change between system types
MicroVAX I has a SET CPU MODEL=(MicroVAX|VAXSTATION) command to change between system types
MicroVAX II has a SET CPU MODEL=(MicroVAX|VAXSTATION) command to change between system types

PDP10 Enhancements

KDP11 (from Timothe Litt) for DECnet connectivity to simulators with DMC, DUP or KDP devices
DMR11 for DECnet connectivity to simulators with DMC, DUP or KDP devices on TOPS10.

SDS 940 Enhancements

Support for SDS internal ASCII character encoding during display and data entry.
Allow breakpoints to be qualified by normal, monitor or user mode.
Fix CPU, RAD, MUX and I/O bugs that prevented SDS Time Share System Monitor and Executive from executing properly.

Terminal Multiplexer additions

Added support for TCP connections using IPv4 and/or IPv6.
Logging - Traffic going out individual lines can be optionally logged to 
        files
Buffering - Traffic going to a multiplexor (or Console) line can 
        optionally be buffered while a telnet session is not connected
        and the buffered contents will be sent out a newly connecting 
        telnet session.  This allows a user to review what may have 
        happened before they connect to that session.

Serial Port support based on work by J David Bryan and Holger Veit
Serial Console Support
Separate TCP listening ports per line
Outgoing connections per line (virtual Null Modem cable).
Packet sending and reception semantics for simulated network device support using either TCP or UDP transport.

Asynchronous I/O

* Disk and Tape I/O can be asynchronous.  Asynchronous support exists 
  for pdp11_rq, pdp11_rp and pdp11_tq devices (used by VAX and PDP11 
  simulators).
* Multiplexer I/O (Telnet and/or Serial) can be asynchronous.  
  Asynchronous support exists for console I/O and most multiplexer 
  devices.  (Still experimental - not currently by default)

Disk Extensions

RAW Disk Access (including CDROM)
Virtual Disk Container files, including differincing disks

Embedded ROM support

Simulators which have boot commands which load constant files as part of 
booting have those files imbedded into the simulator executable.  The 
imbedded files are used if the normal boot file isn't found when the 
simulator boots.  Specific examples are:  VAX (MicroVAX 3900 - ka655x.bin), 
VAX8600 (VAX 8600 - vmb.exe), VAX780 (VAX 11/780 - vmb.exe), 
VAX750 (VAX 11/750 - vmb.exe), VAX730 (VAX 11/730 - vmb.exe), 
VAX610 (MicroVAX I - ka610.bin), VAX620 (rtVAX 1000 - ka620.bin), 
VAX630 (MicroVAX II - ka630.bin)

Control Flow

The following extensions to the SCP command language without affecting prior behavior:

GOTO <Label>                 Command is now available.  Labels are lines 
                             in which the first non whitespace character 
                             is a ":".  The target of a goto is the first 
                             matching label in the current do command 
                             file which is encountered.  Since labels 
                             don't do anything else besides being the 
                             targets of goto's, they could be used to 
                             provide comments in do command files, for 
                             example (":: This is a comment")
SET ON                       Enables error trapping for currently defined 
                             traps (by ON commands)
SET NOON                     Disables error trapping for currently 
                             defined traps (by ON commands)
RETURN                       Return from the current do command file 
                             execution with the status from the last 
                             executed command
RETURN <statusvalue>         Return from the current do command file 
                             execution with the indicated status.  Status 
                             can be a number or a SCPE_<conditionname> 
                             name string.
ON <statusvalue> commandtoprocess{; additionalcommandtoprocess}
                             Sets the action(s) to take when the specific 
                             error status is returned by a command in the 
                             currently running do command file.  Multiple 
                             actions can be specified with each delimited 
                             by a semicolon character (just like 
                             breakpoint action commands).
ON ERROR commandtoprocess{; additionalcommandtoprocess}
                             Sets the default action(s) to take when any 
                             otherwise unspecified error status is returned 
                             by a command in the currently running do 
                             command file.  Multiple actions can be 
                             specified with each delimited by a semicolon 
                             character (just like breakpoint action 
                             commands).
ON <statusvalue>                   
ON ERROR                     Clears the default actions to take when any 
                             otherwise unspecified error status is 
                             returned by a command in the currently 
                             running do command file.

Error traps can be taken for any command which returns a status other than SCPE_STEP, SCPE_OK, and SCPE_EXIT.

ON Traps can specify any status value from the following list: NXM, UNATT, IOERR, CSUM, FMT, NOATT, OPENERR, MEM, ARG, STEP, UNK, RO, INCOMP, STOP, TTIERR, TTOERR, EOF, REL, NOPARAM, ALATT, TIMER, SIGERR, TTYERR, SUB, NOFNC, UDIS, NORO, INVSW, MISVAL, 2FARG, 2MARG, NXDEV, NXUN, NXREG, NXPAR, NEST, IERR, MTRLNT, LOST, TTMO, STALL, AFAIL. These values can be indicated by name or by their internal numeric value (not recommended).

Interactions with ASSERT command and "DO -e": DO -e is equivalent to SET ON, which by itself it equivalent to "SET ON; ON ERROR RETURN". ASSERT failure have several different actions: If error trapping is not enabled then AFAIL causes exit from the current do command file. If error trapping is enabled and an explicit "ON AFAIL" action is defined, then the specified action is performed. If error trapping is enabled and no "ON AFAIL" action is defined, then an AFAIL causes exit from the current do command file.

Other related changes/extensions: The "!" command (execute a command on the local OS), now returns the command's exit status as the status from the "!" command. This allows ON conditions to handle error status responses from OS commands and act as desired.

Scriptable interactions with running simulators.

The EXPECT command now exists to provide a means of reacting to simulator output and the SEND command exists to inject data into programs running within a simulator.

EXPECT {HALTAFTER=n,}"\r\nPassword: "
SEND {AFTER=n,}{DELAY=m,}"mypassword\r"

or

EXPECT {HALTAFTER=n,}"\r\nPassword: " SEND {AFTER=n,}{DELAY=m,}"mypassword\r"; GO

Help

HELP dev
HELP dev ATTACH
HELP dev SET  (aka HELP SET dev)
HELP dev SHOW (aka HELP SHOW dev)
HELP dev REGISTERS

Generic scp support Clock Coscheduling as opposed to per simulator implementations.

New SCP Commands:

SET ENVIRONMENT Name=Value      Set Environment variable
SET ASYNCH                      Enable Asynchronous I/O
SET NOASYNCH                    Disable Asynchronous I/O
SET VERIFY                      Enable commang display while processing DO command files
SET NOVERIFY                    Enable commang display while processing DO command files
SET MESSAGE                     Enable error message output when commands complete (default)
SET NOMESSAGE                   Disable error message output when commands complete
SET QUIET                       Set minimal output mode for command execution
SET NOQUIET                     Set normal output mode for command execution
SET PROMPT                      Change the prompt used by the simulator (defaulr sim>)
SET THROTTLE x/t                Throttle t ms every x cycles
SET REMOTE TELNET=port          Specify remote console telnet port
SET REMOTE NOTELNET             Disables remote console
SET REMOTE CONNECTIONS=n        Specify the number of concurrent remote console sessions
SHOW FEATURES                   Displays the devices descriptions and features
SHOW ASYNCH                     Display the current Asynchronous I/O status
SHOW SERIAL                     Display the available and/or open serial ports
SHOW ETHERNET                   Display the available and/or open ethernet connections
SHOW MULTIPLEXER                Display the details about open multiplexer devices
SHOW CLOCKS                     Display the details about calibrated timers
SHOW REMOTE                     Display the remote console configuration
SHOW ON                         Display ON condition dispatch actions
SET ON                          Enable ON condition error dispatching
SET NOON                        Disable ON condition error dispatching
GOTO                            Transfer to lable in the current DO command file
CALL                            Call subroutine at indicated label
RETURN                          Return from subroutine call
SHIFT                           Slide argument parameters %1 thru %9 left 1
NOOP                            A no-op command
ON                              Establish or cancel an ON condition dispatch
IF                              Test some simulator state and conditionally execute commands
CD                              Change working directory
SET DEFAULT                     Change working directory
PWD                             Show working directory
SHOW DEFAULT                    Show working directory
DIR {path|file}                 Display file listing
LS {path|file}                  Display file listing
NEXT                            Step across a subroutine call or step a single instruction.
EXPECT                          React to output produced by a simulated system
SEND                            Inject input to a simulated system's console

Command Processing Enhancements

Environment variable insertion

Built In variables %DATE%, %TIME%, %DATETIME%, %LDATE%, %LTIME%, %CTIME%, %DATE_YYYY%, %DATE_YY%, %DATE_YC%, %DATE_MM%, %DATE_DD%, %DATE_D%, %DATE_WYYYY%, %DATE_WW%, %TIME_HH%, %TIME_MM%, %TIME_SS%, %STATUS%, %TSTATUS%, %SIM_VERIFY%, %SIM_QUIET%, %SIM_MESSAGE% Command Aliases

Token "%0" expands to the command file name. Token %n (n being a single digit) expands to the n'th argument Tonen %* expands to the whole set of arguments (%1 ... %9)

The input sequence "\%" represents a literal "%", and "\" represents a literal "\". All other character combinations are rendered literally.

Omitted parameters result in null-string substitutions.

A Tokens preceeded and followed by % characters are expanded as environment variables, and if one isn't found then can be one of several special variables:

      %DATE%              yyyy-mm-dd
      %TIME%              hh:mm:ss
      %DATETIME%          yyyy-mm-ddThh:mm:ss
      %LDATE%             mm/dd/yy (Locale Formatted)
      %LTIME%             hh:mm:ss am/pm (Locale Formatted)
      %CTIME%             Www Mmm dd hh:mm:ss yyyy (Locale Formatted)
      %DATE_YYYY%         yyyy        (0000-9999)
      %DATE_YY%           yy          (00-99)
      %DATE_MM%           mm          (01-12)
      %DATE_DD%           dd          (01-31)
      %DATE_WW%           ww          (01-53)     ISO 8601 week number
      %DATE_WYYYY%        yyyy        (0000-9999) ISO 8601 week year number
      %DATE_D%            d           (1-7)       ISO 8601 day of week
      %DATE_JJJ%          jjj         (001-366) day of year
      %TIME_HH%           hh          (00-23)
      %TIME_MM%           mm          (00-59)
      %TIME_SS%           ss          (00-59)
      %STATUS%            Status value from the last command executed
      %TSTATUS%           The text form of the last status value
      %SIM_VERIFY%        The Verify/Verbose mode of the current Do command file
      %SIM_VERBOSE%       The Verify/Verbose mode of the current Do command file
      %SIM_QUIET%         The Quiet mode of the current Do command file
      %SIM_MESSAGE%       The message display status of the current Do command file

Environment variable lookups are done first with the precise name between the % characters and if that fails, then the name between the % characters is upcased and a lookup of that valus is attempted.

The first Space delimited token on the line is extracted in uppercase and then looked up as an environment variable. If found it the value is supstituted for the original string before expanding everything else. If it is not found, then the original beginning token on the line is left untouched.

Command aliases

commands can be aliases with environment variables. For example:

  sim> set env say=echo
  sim> say Hello there
  Hello there
Do command argument manipulation

The SHIFT command will shift the %1 thru %9 arguments to the left one position.

Building and running a simulator

Use Prebuilt Windows Simulators

Simulators for the Windows platform are built and made available on a regular basis (at least once a week if changes have been made to the codebase).

The prebuilt Windows binaries will run on all versions of Microsoft Windows from Windows XP onward.

They can be accessed at https://github.com/simh/Win32-Development-Binaries

Several relatively recent versions should be available which you can download and use directly.

Building simulators yourself

First download the latest source code from the github repository's master branch at https://github.com/simh/simh/archive/master.zip

Depending on your host platform one of the following steps should be followed:

Linux/OSX other *nix platforms

If you are interested in using a simulator with Ethernet networking support (i.e. one of the VAX simulators or the PDP11), then you should make sure you have the correct networking components available. The instructions in https://github.com/simh/simh/blob/master/0readme_ethernet.txt describe the required steps to get ethernet networking components installed and how to configure your environment.

See the 0readme_ethernet.txt file for details about the required network components for your platform. Once your operating system has the correct networking components available the following command will build working simulators:

$ make {simulator-name (i.e. vax)}

Windows

Compiling on windows is supported with recent versions of Microsoft Visual Studio (Standard or Express) and using GCC via the MinGW environment. Things may also work under Cygwin, but that is not the preferred windows environment. Not all features will be available as well as with either Visual Studio or MinGW.

Required related files. The file https://github.com/simh/simh/blob/master/Visual%20Studio%20Projects/0ReadMe_Projects.txt
Visual Studio (Standard or Express) 2008, 2010 or 2012

The file https://github.com/simh/simh/blob/master/Visual%20Studio%20Projects/0ReadMe_Projects.txt describes the required steps to use the setup your environment to build using Visual Studio.

MinGW

The file https://github.com/simh/simh/blob/master/Visual%20Studio%20Projects/0ReadMe_Projects.txt describes the required steps to use the setup your environment to build using MinGW.

VMS

Download the latest source code as a zip file from: https://github.com/simh/simh/archive/master.zip

Unzip it in the directory that you want SIMH to reside in. Unpack it and set the file attributes as follows:

$ unzip simh-master.zip
$ set default [.simh-master]
$ set file/attri=RFM:STM makefile,*.mms,[...]*.c,[...]*.h,[...]*.txt

Simulators with ethernet network devices (All the VAX simulators and the PDP11) can have functioning networking when running on Alpha or IA64 OpenVMS.

In order to build and run simulators with networking support, the VMS-PCAP package must be available while building your simulator. The simh-vms-pcap.zip file can be downloaded from https://github.com/simh/simh/archive/vms-pcap.zip
This link will return a file called simh-vms-pcap.zip which should be unpacked as follows:

$ unzip -aa simh-vms-pcap.zip
$ rename [.simh-vms-pcap]pcap-vms.dir []

The PCAP-VMS components are presumed (by the descript.mms file) to be located in a directory at the same level as the directory containing the simh source files. For example, if these exist here:

[]descrip.mms []scp.c etc.

Then the following should exist: [-.PCAP-VMS]BUILD_ALL.COM [-.PCAP-VMS.PCAP-VCI] [-.PCAP-VMS.PCAPVCM] etc.

To build simulators:

On a VAX use:

$ MMx

On a Alpha & IA64 hosts use:

$ MMx                        ! With Ethernet support
$ MMx/MACRO=(NONETWORK=1)    ! Without Ethernet support

UNZIP can be found on the VMS freeware CDs, or from www.info-zip.org MMS (Module Management System) can be licensed from HP/Compaq/Digital as part of the VMS Hobbyist program (it is a component of the DECSET product). MMK can be found on the VMS freeware CDs, or from http://www.kednos.com/kednos/Open_Source/MMK DEC C can be licensed from HP/Compaq/Digital as part of the VMS Hobbyist program.

Problem Reports

If you find problems or have suggestions relating to any simulator or the simh package as a whole, please report these using the github "Issue" interface at https://github.com/simh/simh/issues.

Problem reports should contain;

  • a description of the problem
  • the simulator you experience the problem with
  • your host platform (and OS version)
  • how you built the simulator or that you're using prebuilt binaries
  • the simulator build description should include the output produced by while building the simulator
  • the output of SHOW VERSION while running the simulator which is having an issue
  • the simulator configuration file (or commands) which were used when the problem occurred.
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