Msdos1

A collection of disassembled and commented source of parts of MS-DOS 1.0

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MS-DOS 1.0

This is a collection of disassembled and commented source of parts of MS-DOS 1.0, which can be assembled back into (almost) identical binaries (using NASM).

bootsect

The DOS 1.0 boot sector. See Reverse-Engineering DOS 1.0 – Part 1: The Boot Sector for more info.

ibmbio

The DOS 1.0 I/O library. See Reverse-Engineering DOS 1.0 – Part 2: IBMBIO.COM for more info.

ibmdos

The DOS 1.0 Kernel. There is no disassembly for it yet.

Author

The original code is Microsoft's. The disassembly was done by Michael Steil.

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