Collection of ancient computer virus source codes

Floppy Bird (OS)

A 54 bytes snake game in x86 assembly

The Touhou PC-98 Restoration Project

Tool to convert DOS Assembly code to C code

Home of the HX DOS Extender and its DPMI-host HDPMI.

A modern, scratch-built, open-source (GPLv3) alternative ROM BIOS for PC, XT, 8088 Clone or Turbo PCs.

Jemm386 and JemmEx are socalled EMMs ( Expanded Memory Managers ) or, more exactly, V86 monitors.

Turbo Assembler 5: Borland.

Enhanced DR-DOS kernel and command interpreter ported to JWasm and OpenWatcom C

A new 8086-based reimagining of PC DOS and BASIC

Bootable minesweeper game in a 512-byte boot sector

MASM 6.11 : Microsoft.

Microsoft DOS 4.00

DOS eXtended Memory Manager (XMM)

A 23-byte “hello, world” program assembled with DEBUG.EXE in MS-DOS

2021 version of DOS/32A DOS Extender.

Register Allocator for 8086

A 16 bit operating system made from enthusiasts to enthusiasts with love

DOS utilities by Vernon D. Buerg.