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The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes

79 mentions on Hacker News by 68 people: 5 stories, 74 comments · first 2018-09-28 · latest 2026-09-20

Mentions per year 79 mentions · busiest year 2024 (22)
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  1. …are now finally available thanks to Microsoft's release of the early MS-DOS source code. [1] https://github.com/microsoft/MS-DOS/blob/master/v1.25/source... [2] https://github.com/Microsoft/MS-DOS/blob/master/v1.25/source...
    comment by kiwidrew · 2021-06-05 · in 8088ify: Intel 8080 CP/M 2.2 to Intel 8086/8088 IBM PC DOS assembly translator
  2. MS-DOS 1.25 (1983) is on Github https://github.com/microsoft/MS-DOS
    comment by bdcravens · 2021-05-31 · in WordTsar, a WordStar Clone
  3. …clear how Microsoft intended for MS-DOS to be configured, but alas IBM had other ideas... [1] https://github.com/microsoft/MS-DOS/blob/master/v2.0/source/... [2] https://github.com/microsoft/MS-DOS/blob/master/v2.0/bin/CON...
    comment by kiwidrew · 2021-02-26 · in Why is the DOS path character "\"? (2005)
  4. …security and legal problems. Although I do wish they could start with open sourcing the Kernel. [1] https://github.com/microsoft/MS-DOS
    comment by ksec · 2021-02-09 · in ReactOS Updates
  5. Yep. https://github.com/microsoft/MS-DOS
    comment by easton · 2021-02-09 · in ReactOS Updates
  6. …primitive program loader. msdos.sys, io.sys, and command.com Source is interesting, I took a look: https://github.com/microsoft/MS-DOS/tree/master/v2.0/source
    comment by mixmastamyk · 2021-02-02 · in Itanium: Mark Architecture as Orphaned
  7. …function – INT 21h,AH=4Bh,AL=03h. You can see the references in the MS-DOS source code here: https://github.com/microsoft/MS-DOS/blob/master/v2.0/source/... This was already known long before Microsoft released the MS-DOS 2.x source code;…
    comment by skissane · 2020-08-11 · in A look back at memory models in 16-bit MS-DOS
  8. …systems, and programs could target a single common DOS/Xenis API and could be run on either OS. [1] https://github.com/microsoft/MS-DOS/blob/master/v2.0/source/... [2] https://github.com/microsoft/MS-DOS/blob/master/v2.0/source/...
    comment by kiwidrew · 2020-07-30 · in Berners-Lee 'Sorry' for Slashes (2009)
  9. …of msdos[1], though probably anything less than 3.3 only has historical value to anyone. [1] https://github.com/microsoft/MS-DOS
    comment by compsciphd · 2020-06-01 · in The 5.7 kernel is out
  10. Microsoft did open source 1983's DOS: https://github.com/Microsoft/MS-DOS Given they've only made it to DOS 2.0 so far, it might take them a while to open source Windows 95, but it no longer seems like an impossibility either.
    comment by WorldMaker · 2020-05-22 · in EA will be releasing the C&C Tiberian Dawn and Red Alert source code under GPL3
  11. …in another reply, you'd probably want to start with the MASM and LINK from the MS-DOS 2.0 release. https://github.com/microsoft/MS-DOS/tree/master/v2.0/bin
    comment by oso2k · 2020-05-22 · in The original source code of Microsoft GW-BASIC from 1983
  12. …the DOS 2.0 release [0], build each ASM file as an OBJ, and finally LINK it all together [1]. [0] https://github.com/microsoft/MS-DOS/blob/master/v2.0/bin/MAS... [1] https://github.com/Microsoft/MS-DOS/issues/201
    comment by oso2k · 2020-05-22 · in The original source code of Microsoft GW-BASIC from 1983
  13. …a kid in the late 80's. I just noticed that microsoft has also released the source to MS-DOS 2.0: https://github.com/microsoft/MS-DOS I don't think I ever imagined that I'd be able to "look behind the curtain" like this, let alone that…
    comment by tobinfricke · 2020-05-21 · in The original source code of Microsoft GW-BASIC from 1983
  14. Fair point. I leave the post as is for posterity. I wonder if https://github.com/Microsoft/MS-DOS will improve that situation.
    comment by mey · 2020-05-18 · in Termux and Android 10
  15. Also, don't forget this: https://github.com/microsoft/MS-DOS
    comment by peter_d_sherman · 2020-04-13 · in Writing a DOS Clone in 2019
  16. …Windows 3.11 lately, did they release it free recently? Like they did early versions of MSDOS? https://github.com/microsoft/MS-DOS
    comment by fuball63 · 2020-01-10 · in Did you ever need to run a piece of C# code on Windows 3.11?
  17. …8088 experience, you could use the assembler that came with MS-DOS 1.25, written by Tim Paterson: https://github.com/microsoft/MS-DOS/blob/master/v1.25/source...
    comment by userbinator · 2019-10-03 · in Show HN: 8086/8088 assembler that runs over 8088 hardware with modern syntax
  18. No, I mean MS-DOS https://github.com/microsoft/MS-DOS
    comment by faissaloo · 2019-09-25 · in ReactOS 0.4.12
  19. https://github.com/microsoft/ms-dos may also be interesting
    comment by mey · 2019-06-28 · in FreeDOS's Linux Roots
  20. …way, reading each directory entry one by one and doing the pattern matching after the fact. [0] https://github.com/Microsoft/MS-DOS/blob/master/v1.25/source...
    comment by badsectoracula · 2019-02-25 · in The structure of the special type of DOS files called directories (1998)
  21. …side, so it might have taken advantage of that... but there isn't source code for MS-DOS 3.0. [0] https://github.com/Microsoft/MS-DOS/tree/master/v2.0/source [1] https://github.com/Microsoft/MS-DOS/blob/master/v2.0/source/... [2]…
    comment by badsectoracula · 2019-02-25 · in The structure of the special type of DOS files called directories (1998)
  22. Is this it? https://github.com/Microsoft/MS-DOS/blob/master/v2.0/source/...
    comment by reffaelwallen · 2018-11-04 · in An error message, still found in Windows 10, is a mistake from 1974
  23. …eventually. [0] https://github.com/dotnet/core [1] https://github.com/Microsoft/ChakraCore [2] https://github.com/Microsoft/MS-DOS
    comment by Klathmon · 2018-10-26 · in Microsoft completes GitHub acquisition
  24. ▲ 29
    The original sources of MS-DOS 1.25 and 2.0 are Open Source now
    story by tobltobs · 2018-09-29 · 1 comment
  25. Don't overlook the email by v1.25 (and v2.0?) author Tim Paterson: https://github.com/Microsoft/MS-DOS/blob/master/v1.25/Tim_Pa... ... or the version history in the v2.0 MSHEAD.ASM file: https://github.com/Microsoft/MS-DOS/blob/master/v2.0/…
    comment by forapurpose · 2018-09-29 · in The original sources of MS-DOS 1.25 and 2.0
  26. It is pretty suprising, all things being equal. I'd suggest keeping a close eye on this issue: https://github.com/Microsoft/MS-DOS/issues/2
    comment by rnd0 · 2018-09-29 · in The original sources of MS-DOS 1.25 and 2.0
  27. It's MIT licensed too! https://github.com/Microsoft/MS-DOS/blob/master/LICENSE.md I was kind of surprised about that!
    comment by scruffyherder · 2018-09-29 · in The original sources of MS-DOS 1.25 and 2.0
  28. It looks like they set the commit dates to match the release dates: https://github.com/Microsoft/MS-DOS/commits/master
    comment by iguessthislldo · 2018-09-29 · in The original sources of MS-DOS 1.25 and 2.0
  29. ▲ 328
    The original sources of MS-DOS 1.25 and 2.0
    story by plurby · 2018-09-28 · 115 comments