SIMH

Spec sheet

Purpose

SIMH is a collection of simulators for historically significant or otherwise interesting computer hardware and software.Read 11 Oct 2026 · simh.trailing-edge.com

Support

The site points users to documentation, help guides, and a SimH users' mailing list for support and questions.Read 11 Oct 2026 · simh.trailing-edge.com

License

The V3 and Open SIMH V4 source code is licensed under an MIT-style open-source license.Read 11 Oct 2026 · simh.trailing-edge.com

Founded

1993Read 28 Sep 2026 · simh.trailing-edge.com

Build requirements

The HP simulator source distributions are written in portable C, and the page says no additional libraries are needed to build them.Read 11 Oct 2026 · simh.trailing-edge.com

Downloads

The HP simulator page offers source distributions and precompiled 32-bit Windows executables for Windows XP and later.Read 11 Oct 2026 · simh.trailing-edge.com

HP platform support

The HP simulator pages state that those simulators run on common PC and Mac platforms running Windows, Linux, FreeBSD, or macOS.Read 11 Oct 2026 · simh.trailing-edge.com

HP simulator scope

The HP simulator page says its HP 2100 implementation does not model the 1000 L/A-Series machines.Read 11 Oct 2026 · simh.trailing-edge.com

Machine coverage

The V3 release lists simulators for systems including Data General, DEC, IBM, Interdata, HP, Honeywell, MITS Altair, and others.Read 11 Oct 2026 · simh.trailing-edge.com

No commercial pricing

The site describes SIMH as open-source software and offers downloads, with no paid plans or prices stated on the pages reviewed.Read 11 Oct 2026 · simh.trailing-edge.com

Project goal

The project aims to create highly portable system simulators and publish them as open-source software with freely available copies of significant or representative software.Read 11 Oct 2026 · simh.trailing-edge.com

Release

The site's latest listed V3 source and documentation release is SIMH V3.12-5, updated July 16, 2024.Read 11 Oct 2026 · simh.trailing-edge.com

Release changes

SIMH V3.12-5 release notes say the release is mostly bug fixes and adds Chaosnet support to the PDP-10 and PDP-11 simulators.Read 11 Oct 2026 · simh.trailing-edge.com

Simulator coverage

SIMH V3.x includes simulators for systems including Data General Nova and Eclipse, DEC PDP and VAX systems, IBM systems, HP systems, and the MITS Altair 8800.Read 11 Oct 2026 · simh.trailing-edge.com

Software kits

The site lists software kits for several simulated systems, and says some kits have licenses that restrict their use.Read 11 Oct 2026 · simh.trailing-edge.com

Software tools

The site also provides tools for manipulating simulator file formats and cross-assembling code for the PDP-1, PDP-7, PDP-8, and PDP-11.Read 11 Oct 2026 · simh.trailing-edge.com

Tools

The site offers tools for manipulating simulator file formats and cross-assembling code for PDP-1, PDP-7, PDP-8, and PDP-11 systems.Read 11 Oct 2026 · simh.trailing-edge.com

V3 release

The site lists SIMH V3.12-5 as the latest V3 source and documentation release, updated 16 July 2024.Read 11 Oct 2026 · simh.trailing-edge.com

V4 stream

The site says the enhanced V4 stream contains additional simulators and is available on GitHub as Open-SimH.Read 11 Oct 2026 · simh.trailing-edge.com

Where Specifiction places it

• Multi-System Emulators#52 of 546.7