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I am a big fan of 86-DOS, the operating system which was sold to Microsoft to become MS-DOS.

Below are some of my DOS works, done with my friend Rich Cini and others:

• 86-DOS 0.11 source code - reconstructed source code of 86-DOS 0.11, the earliest version of DOS
• Paterson's DOS printouts - printer listings containing DOS source code, from Tim Paterson
• 86-DOS on IBM PC ports - every version of 86-DOS ported to run on the IBM PC
• SCP 8086 Monitor - the monitor ROM for booting 86-DOS
• MicroPro WordMaster - the text editor Tim Paterson used to write DOS
• IBM PC-DOS 1.00 BIOS & boot sector - my journey disassembling the PC-DOS 1.00 BIOS and boot sector

Page written by Yufeng Gao. Last updated: 2026/03/15.