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SIMH is a free and open source, multi-platform multi-system emulator. It is maintained by Bob Supnik, a former DEC engineer and DEC vice president, and has been in development in one form or another since the 1960s.
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| Developer(s) | Robert M. Supnik |
|---|---|
| Initial release | 1993[1] |
| Stable release | |
| Repository | |
| Written in | C |
| Operating system | Windows, Linux, macOS, FreeBSD, OpenBSD, NetBSD, OpenVMS |
| Platform | x86, IA-64, PowerPC, SPARC, ARM |
| Type | Hardware virtualization |
| License | BSD-style licenses |
| Website | simh |
SIMH was based on a much older systems emulator called MIMIC, which was written in the late 1960s at Applied Data Research.[1] SIMH was started in 1993 with the purpose of preserving minicomputer hardware and software that was fading into obscurity.[1]
In May 2022, the MIT License of SIMH version 4 on GitHub was unilaterally modified by a contributor to make it no longer free software, by adding a clause that revokes the right to use any subsequent revisions of the software containing their contributions if modifications that "influence the behaviour of the disk access activities" are made.[3] As of 27 May 2022, Supnik no longer endorses version 4 on his official website for SIMH due to these changes, only recognizing the "classic" version 3.x releases.[4]
On 3 June 2022, the last revision of SIMH not subject to this clause (licensed under BSD licenses and the MIT License) was forked by the group Open SIMH, with a new governance model and steering group that includes Supnik and others. The Open SIMH group cited that a "situation" had arisen in the project that compromised its principles.[5]
SIMH emulates hardware from the following companies.
Advanced Computer Design
- PDQ-3
AT&T
BESM
Burroughs
Control Data Corporation
Data General
Digital Equipment Corporation
GRI Corporation
- GRI-909
Hewlett-Packard
Honeywell
- H316
- H516
Hobbyist projects
IBM
Intel
- Intel systems 8010 and 8020
Interdata
- 16-bit series
- 32-bit series
Lincoln Labs – MIT Research Lab
Manchester University
MITS
- Altair 8800 both Intel 8080 and Zilog Z80 versions
Norsk Data
Royal-Mcbee
- LGP-30
- LGP-21
Sage Computer Technology
- Sage II
Scientific Data Systems
SWTPC
Systems Engineering Laboratories
- SEL-32 both Concept-32 and PowerNode systems
Xerox Data Systems
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