Utilities for handling virtual tapes in several formats.

Yet another Game Boy Emulator

A language-agnostic JSON-encoded instruction-by-instruction test suite for the 8088, 68000, 65816, 65[c]02 and SPC700 that includes bus activity.

Reading and analyzing IBM 23FD Minnow floppy disks

A collection of NASA (and others) public domain software, much of which is for early mainframes like the IBM360 and 7090/7074

The Open SIMH simulators package

A collection of tools for use with SIMH

The Open SIMH simulators package

Burroughs B5500, ICL1900, SEL32, IBM 360/370, IBM 7000 and DEC PDP10 KA10/KI10/KL10/KS10, PDP6 simulators for SimH

Simulator of an IBM System/360 Model 50

DECsystem-10 (PDP-10 KI10) Emulator in Javascript

utilities and command line hacks for FRESS retrocomputing

Tests for all valid opcodes of the 6502 and 65C02 processor

x86 CPU tester for emulators

Simulation code for the specific PDP-10 serial number 32 at the Stanford A. I. Lab in 1974 as a solo processor with all the I/O devices simulated as on the PDP-10. Omit the co-processor PDP-6 sn16.

The SDL Hercules 4.x Hyperion version of the System/370, ESA/390, and z/Architecture Emulator

MSE - Multi-System Emulator

This is the original source code for the CP/67 CMS operating system from 1969

SoftFloat release 3

tic-tac-toe in a single call to printf

The original source code of Microsoft GW-BASIC from 1983

Source code of a multiple series of tutorials about the hypervisor. Available at: https://rayanfam.com/tutorials

Prime 50-Series Emulator

Software to curate and present the SAILDART archive of backup tape data from the first Stanford Artificial Intelligence Lab of the 1970s.

KL10 model B (KL10-PV) PDP-10 CPU emulation through execution of the original microcode

Abandoned PDP-10/TOPS-10 Emulator

The undocumented 68000