{"id":818218,"date":"2025-12-08T18:52:51","date_gmt":"2025-12-08T18:52:51","guid":{"rendered":"http:\/\/HqniBAa9RUPaQLhwYn5x8h"},"modified":"2025-12-08T18:52:51","modified_gmt":"2025-12-08T18:52:51","slug":"microsoft-has-released-the-source-code-for-ms-dos-4-0-and-its-giving-me-all-the-nostalgia-feels","status":"publish","type":"post","link":"https:\/\/arcader.org\/news\/microsoft-has-released-the-source-code-for-ms-dos-4-0-and-its-giving-me-all-the-nostalgia-feels\/","title":{"rendered":"Microsoft has released the source code for MS-DOS 4.0 and it’s giving me all the nostalgia feels"},"content":{"rendered":"
\n

Ah, the PC in the spare room. Back when “going on the computer” was an event, not a daily necessity, I cut my teeth on MS-DOS games. I didn't really know how they worked, and I wasn't very good, but there a hardware and gaming enthusiast was born. Now Microsoft has released the source code for MS-DOS 4.0<\/a> in partnership with IBM, and apparently, all it takes is the logo to make me go all mushy.<\/p>\n

This isn't the first time Microsoft has open-sourced MS-DOS, as its GitHub repository<\/a> already has versions 1.25 and 2.0, which were originally shared at the Computer History Museum back in 2014. Now a decade later it's MS-DOS 4.0's turn to get the source code release treatment.<\/p>\n

Microsoft's version of MS-DOS 4.0 was originally released back in 1986 after a joint development with IBM for portions of the code, and a somewhat difficult relationship between the two at the time led to two branches eventually being released, MS-DOS 4.0<\/a> and what is now referred to as IBM DOS 4.0<\/a>.<\/p>\n

The Microsoft version, sometimes referred to as European MS-DOS 4.0, featured support for the New Executable file format, and pre-emptive multitasking. However, it retained many of the limitations of MS-DOS 3.0, including the inability to use memory above 640 KB.<\/p>\n

While neither version set the world on fire\u2014and perhaps overall both releases should be viewed more as Vista than Windows 7\u2014I'm pretty sure it was one of these versions I used on our rubbish spare room machine, and that it allowed me to play Doom and F-15 Strike Eagle II<\/a>.\u00a0<\/p>\n

That was good enough for little ol' me. Simpler times, ey?<\/p>\n

\n
Your next upgrade<\/div>\n
\n
\n
\n
\n

\"Nvidia<\/p>\n<\/div>\n<\/div>

(Image credit: Future)<\/span><\/figcaption><\/figure>\n

Best CPU for gaming<\/strong><\/a>: The top chips from Intel and AMD.
\nBest gaming motherboard<\/strong><\/a>: The right boards.
\nBest graphics card<\/strong><\/a>: Your perfect pixel-pusher awaits.
\nBest SSD for gaming<\/strong><\/a>: Get into the game ahead of the rest.<\/p>\n<\/div>\n<\/div>\n

The open-sourcing of this version of MS-DOS was made possibly by a researcher, who got in touch with Microsoft regarding some unreleased beta binaries of DOS 4.0 they'd found on a stack of old floppies from their time working at Lotus<\/a>. These disks were imaged and scanned to reveal that they were earlier, unreleased versions of the OS.<\/p>\n

This discovery, along with some included printed documents, kicked off a hunt through the Microsoft Archives where the original full source code of MS-DOS 4.0 was found.<\/p>\n

Microsoft says that they've successfully run it on an original IBM PC XT, a “newer” Pentium, and within open source PCem<\/a> and 86box<\/a> emulators, so if you're the sort of person that likes messing around with a bit of PC archaeology, here's another old-school curiosity to enjoy.<\/p>\n<\/article>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Ah, the PC in the spare room. Back when “going on the computer” was an event, not a daily necessity, I cut my teeth on MS-DOS games. I didn't really know how they worked, and I wasn't very good, but there a hardware and gaming enthusiast was born. Now Microsoft has released the source code for MS-DOS 4.0 in partnership with IBM, and apparently, all it takes is the logo to make me go all mushy. This isn't the first time Microsoft has open-sourced MS-DOS, as its GitHub repository already has versions 1.25 and 2.0, which were originally shared at the Computer History Museum back in 2014. Now a decade later it's MS-DOS 4.0's turn to get the source code release treatment. Microsoft's version of…<\/p>\n

Read More…<\/a><\/p>\n","protected":false},"author":1,"featured_media":818219,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[336],"tags":[66],"class_list":["post-818218","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pc-gamer","tag-hardware"],"yoast_head":"\nMicrosoft has released the source code for MS-DOS 4.0 and it's giving me all the nostalgia feels | Arcader News<\/title>\n<meta name=\"description\" content=\"Ah, the PC in the spare room. Back when "going on the computer" was an event, not a daily necessity, I cut my teeth on MS-DOS games. 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