Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

Coverity Scan Build Status

This is a working copy of my Burroughs B5500, Dec PDP6, KA10, KI10, KL10, KS10, SEL32, IBM 360 and IBM7000 series simulators for SimH.

Stable released simulators.

IBM 7000 simulators.

Latest status for I7000 Cpus:


  • Largely untested.


  • SAP works.
  • Fortran II works in some cases.


  • PR155 works.
  • PR108 works.
  • Most Diags appear to pass without serious error.
  • Protection mode has some errors left.
  • Protection mode does not handle setting H or L to 0.


  • Will load Diags.


  • Sort of working.

  • RWW, ECB untested.

  • TLx instructions implimented, untested, see 8SE

  • Will boot from card.

  • Tape system appear to be working.

  • 8CU10B errors:
    410, 412, 413, 414, 418, 419, 420-427 error becuase storage is not parity checked.
    440 divide not producing correct sign on error.


  • Working with exceptions.

  • Known bugs:

    • DFDP/DFMP Sometimes off by +/-1 or 2 in least signifigant part of result.
    • EAD +n + -n should be -0 is +0
    • Not all channel skips working for 9P01C.
    • HTx Not sure what problems are, does not quite work.
    • DKx Sometimes fails diagnostics with missing inhibit of interrupt.
  • CTSS works.

  • IBSYS works.

  • Stand alone assembler works.

  • Lisp 1.5 works.

  • Signifigance mode Not tested, Test Code Needed.

Burroughs B5500

Emulates a dual CPU B5500 with up to 32K of memory. I can support either DFX disks or dual disks up to 20 units. Up to 16 magnetic tapes drives is support. 2 Card readers a card punch and a pair of line printers. Will run MCP XIII and XV.

  • Up to either 10 disks with DFX support or 20 disks without.
  • Up to 16 magnetic tape drives.
  • Dual card reader.
  • Dual Line printer.
  • Single card punch.
  • Up to 32 terminal lines.

Dec PDP6

The PDP6 simulator is part of the KA/KI simulator. The PDP6 devices can be built into the KA10 simulator if desired.

The PDP6 runs TOPS 10 4.5 off Dectape.


  • 270 Disk


  • 551 Tape
  • 555 Dectape.

Paper Tape

  • Punch
  • Reader

Type 630 Terminal mux.

Type 340 graphics display.

Dec KA10 & KI10 & KL10 & KS10

The KA10 sim has successfully run Tops 10 4.5, 5.03 and 6.03, ITS and WAITS.
The KI10 sim has successfully run Tops 10 6.03 with VMSER.
The KL10 sim has successfully run Tops 10 6.03-7.03, ITS and Tops 20 V2-V7.
The KS10 sim has successfully run Tops 10, Tops 20 and ITS.


  • RC10 RD10/RM10
  • RP10 RP01/RP02/RP03
  • RH10/RH20 RP04/RP06/RP07 (RP07 not supported under 6.03).
  • RH10/RH20 RS04
  • System Concepts DC-10 IBM 2314


  • TM10A or B
  • RH10/RH20 TM03/TU16
  • TD10 Dectape

Paper Tape

  • Punch

  • Reader

  • DC10E terminal mux.

  • Morton tty Mux for ITS.

  • Knight Kludge mux for ITS.

  • Terminals on KL10 Front End.

  • DZ11 on KS10.

  • LP10 Line printer.

  • LP20 Line printer on KL10 Front End, and KS10.

  • IMP networking support for ITS and TENEX.

  • NIA20 networking support for KL10.

  • CH10 networking support for ITS.

  • CH11 networking support for ITS (KS10).

  • DUP11 networking support for KS10.

  • 340 Display Station support.

  • III Display support for WAITS.

  • Optional support for PDP6 devices (standard if WAITS included).

The RP10 supports boot (actual hardware did not), by reading in Blocks 4-7 and transfering to the loaded value. RC10, RH10, TM10 support readin mode.

The KS10 supports RH11/RP and RH11/TM03 drives.

ICL 1900 simulator.

This is a new simulator. Will pass 1904E/1905E CPU diagnostics (FLIT). Will boot paper tape executive E4BM and tape executive E6RM. Still need to add more devices and test with George 2 and 3.

The CPU can be configured for model A, B or C type system. Or models 1901 throgh 1909. Paging is currently not supported. Both standard interface and older non-standard interface are supported on most device.

IBM 360 simulator.

Currently will run BOS/360, TOS/360, DOS/360, OS/360. IBM 360/67 support added for MTS early versions. IBM 370 support will currently run VM/370, TSS, OS/VS1. Support for the following units:

DASD (Disk) Up to 4 devices of 8.
* 2301, 2302, 2303, 2305, 2311, 2314, 3330, 3340, 3350.

Tape, 8 devices.
* 2400 (7 track and 9 track).

Unit record
* 2540 Card reader
* 2540 Card punch
* 1403 Line Priner
* 1050 Console

* 2703 with 16 lines of 1050.
* 3704 with 8 lines of 3270.

SEL32 Concept/32 Simulator

This is a working simulator for the SEL Concept/32 line of computers. The current version is for the SEL 32/27, 32/67, 32/87, 32/97, V6, and V9 computers. Support for 32/55, and 32/75 computers may be added in the future. This simulator is co-authors with James C. Bevier. I did the initial parts of the simulator, James took it to a working simulator, I am assisting him in maintaining and enhancing the simulator.

All of the processors except for the 32/77 can run the Gould diags. MPX 1.X support for the 32/77 computers may be added in the future. The level one diags are run as part of the SIMH build of SEL32 to verify that the simulator is operating correctly. The diags are located in the tests directory. Diag.tap contains the diagnostic programs and diag.ini contains the directives to configure and run the SEL32 simulator.

This simulator is capable of running UTX2.1A, UTX2.1B, MPX 1.5F, MPX 3.4, MPX 3.5 and MPX 3.6. It is capable of creating a disk image for the O/S from a UTX or MPX SDT tape. The disk image can be booted, initialized, and can run many of the UTX and MPX utilities and programs. Ethernet is supported on UTX and will be added to MPX in the future. Eight terminals can be used to access MPX via Telnet port 4747. The sumulator has support for excess 64 floating point arithmetic and passes the 32/27 and 32/67 FP diags. UTX is the SEL version of System V Unix and BSD Unix ported to the V6 and V9 processors. UTX utilizes the basemode instruction set and a virtual memory system supported by the V6 & V9 CPUs. The system needs further testing to solidify the SEL32 simulator code in all of the supported environmenets.