simh/simh
The Computer History Simulation Project observed · 2026-08-28
Health v2 · maintenance only
66/100
- Activity 97
- Release rhythm 8
- Longevity 100
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5615
- days_rel: n/a
- days_push: 22
- n_releases_24m: 0
Adoption not part of the score
1877 stars · 315 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
SIMH is a collection of highly portable simulators for historically significant computer systems such as the DEC PDP series, VAX, IBM mainframes, and Altair 8800. It lets users run vintage operating systems and software on modern hardware, preserving computing history.
Use cases
- run old VAX or PDP-11 operating systems on a modern PC
- emulate vintage computers like the PDP-8 or IBM 1401
- preserve and study historic computer software
- boot retro operating systems for learning or nostalgia
- test legacy software without original hardware
- explore the history of computing through working simulations
When to choose
- you need to run or preserve software for emulated historic hardware
- you want a portable, scriptable multi-system simulator in C
- you're researching vintage operating systems or computer architecture
When to avoid
- you need emulation of modern hardware or gaming consoles
- you want a GUI-first emulator with plug-and-play disk images
- you need cycle-accurate hardware-level emulation for restoration work
Facets
application · maturity active
simulation interpreter developer-tools simulation operating-systems hardware developer-tools education windows cross-platform cli emulator retro-computing pdp-11 vax computer-history legacy-systems linux macos
3 sources
- readme: https://github.com/simh/simh · fetched 2026-08-28 · 4929e1a8b5a4
- homepage: http://simh.trailing-edge.com · fetched 2026-08-29 · dd9f93df9788
- site_page: http://simh.trailing-edge.com/pdf/all_docs.html · fetched 2026-08-29 · a90756f784fc
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| simh/simh | main | 66 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem