Links from 2026-01-13

The Late Arrival of 16-bit CP/M - by Nemanja Trifunovic

The story of how MS-DOS became the industry standard for the 16-bit business computers at the expense of Digital Research’s CP/M is somewhat of a legend among fans of computing history. The event has been described in books, articles and documentaries, with most of them focusing on entertaining details such as corporate drama, back-stabbing and nepotism1.

Some of the more serious accounts mention one important detail of the story: DRI was late with the port of the CP/M to the Intel 8086. When IBM representatives visited in August of 1980, looking for an operating system for their upcoming PC, only the 8-bit version of CP/M could be demonstrated. IBM eventually turned to Microsoft and selected what became MS‑DOS.

In this article, we will examine why CP/M‑86 was delayed and, in the end, speculate how much that delay actually mattered.

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[Mittwoch, 20260114, 05:00 | permanent link | 0 Kommentar(e)


Links from 2026-01-08

UNIX V4 tape successfully recovered

Computer History Museum software curator Al Kossow has successfully retrieved the contents of the over-half-a-century old tape found at the University of Utah last month.

UNIX V4, the first ever version of the UNIX operating system in which the kernel was written in the then-new C programming language, has been successfully recovered from a 1970s nine-track tape drive. You can download it from the Internet Archive, and run it in SimH.

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[Freitag, 20260109, 05:00 | permanent link | 0 Kommentar(e)


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„Leyrers Online Pamphlet“ ist die persönliche Website von mir, Martin Leyrer. Die hier veröffentlichten Beiträge spiegeln meine Ideen, Interessen, meinen Humor und fallweise auch mein Leben wider.
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