mirror of
https://github.com/microsoft/MS-DOS.git
synced 2024-11-28 16:45:46 +00:00
24 lines
1.1 KiB
Plaintext
24 lines
1.1 KiB
Plaintext
From: Tim Paterson
|
|
To: Len Shustek
|
|
Date: Mon, 16 Dec 2013 10:34:17 -0800
|
|
Subject: RE: Source code to MS-DOS 1.0
|
|
|
|
|
|
I have found and attached the source code for MS-DOS 1.25 as shipped by Seattle Computer Products. Version 1.25 was the first general release to OEM customers other than IBM so was used by all the first clone manufacturers.
|
|
|
|
IBM's DOS 1.1 corresponds to MS-DOS 1.24. There is one minor difference between 1.24 and 1.25, as noted in the revision history at the top of MSDOS.ASM.
|
|
|
|
Of the file attached, only STDDOS.ASM/MSDOS.ASM (DOS main code) and COMMAND.ASM (command processor) would have been used by an OEM other than Seattle Computer. The other files:
|
|
|
|
IO.ASM - I/O system unique to SCP (equivalent to ibmbio.sys).
|
|
ASM.ASM & HEX2BIN.ASM - Old 8086 assembler developed by SCP (used to assemble older version of DOS).
|
|
TRANS.ASM - Z80 to 8086 assembly source code translator developed by SCP.
|
|
|
|
I also have a 6” stack of printouts of assembly listings for some of these and probably other related programs.
|
|
|
|
Tim Paterson
|
|
Paterson Technology
|
|
http://www.patersontech.com/
|
|
|
|
|