The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes

A FREE comprehensive reverse engineering tutorial covering x86, x64, 32-bit/64-bit ARM, 8-bit AVR and 32-bit RISC-V architectures.

Hello world in every computer language. Thanks to everyone who contributes to this, make sure to see contributing.md for contribution instructions!

mal - Make a Lisp

Microsoft BASIC for 6502 Microprocessor - Version 1.1

RISC-V Guide. Learn all about the RISC-V computer architecture along with the Development Tools and Operating Systems to develop on RISC-V hardware.

A project to resurrect Unix on the PDP-7 from a scan of the original assembly code

DB6502: 65C02 based computer inspired by BE6502

Various emulator-related infos from all over the net.

QNICE-FPGA is a 16-bit computer system for recreational programming built as a fully-fledged System-on-a-Chip in portable VHDL.

GCBasic demonstrations source code