MS-DOS source code

[sinsi]

Thanks to Ali.Z at the FASM board

MS-DOS v1.25, v2.0, v4.0 Source Code

[_japheth]

Thanks for info!

The package also contains the tools needed to create the binaries.

There's MS C 5.1 and Masm 5.1, very nice little programs to create 16-bit real-mode programs, supporting small, medium, compact, large and huge memory models. Super cool!

The source even includes EMM386 and SMARTDRV!!!

[NoCforMe]

I loves some of the comments in the code, which tell us more than even the code itself:

Code Select Expand

;   Rev 3.1 MarkZ   3.1 in label due to vagaries of SYSing to IBM drive D's
;            This resulted in the BPB being off by 1.  So we now trust
;            2.0 and 3.1 boot sectors and disbelieve 3.0.

Shows some of the intricacies of the problems the programmers were faced with back in the day.

[learn64bit]

text file encoding
  github
    65001withoutBOM
  MS-DOS v4.0
    00437

MS-DOS-main.zip\MS-DOS-main\v4.0\
  MAPPER\GETMSG.ASM
  SELECT\
    SELECT2.ASM
    USA.INF

above 3 files messed up by 65001 encoding.
fix it back to 00437 (undo the 65001 convertion), then compile dosV4 is ok

[learn64bit]

almost forgot...
also 0D0Ah messed up by github.
.bat, .asm, .skl, zero.dat and locscr
undo the 0D0Ah to 0Ah