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Did Microsoft steal DOS from CP/M?

Dave Farquhar Retro Computing August 8, 2016February 21, 2022computer software, Digital Research, Gary Kildall, IBM, intel, Jerry Pournelle, podcast, SCO

Did Microsoft steal DOS from CP/M? There’s $100,000 in it for you if you can prove they did.

Digital forensics consultant Bob Zeidman still says no. I’ve written about him before. But the rumors persist, hence the reward. So how would one go about claiming it?

Start with what we know.

Dave Farquhar

David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.

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Bombshell: Ballmer steps down from Microsoft

Dave Farquhar Uncategorized August 24, 2013March 25, 20251980s, 1990s, Bill Gates, Digital Research, IBM, office 2007, Spare Parts, Steve Ballmer, vista, windows 8, Windows Vista

I’m sure you’ve heard by now that Steve Ballmer is retiring. It’s time. If anything, I agree with the people who say he would have been better off retiring years ago. But I really didn’t expect it. In spite of the immense pressure to step aside, at least in public he never gave any indication of having any intention of doing so. Read more

Dave Farquhar

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Where Microsoft lost its way

Dave Farquhar Windows June 7, 2013July 9, 20171980s, 1990s, 6502, amiga, android, apple, apple ii, AT&T, atari, atari st, commodore, Digital Research, excel, IBM, IOS, Microsoft Basic, MOS, motorola, motorola 68k, nintendo, sony, unix, windows 8, windows me, xbox, XT

John C. Dvorak wrote an analysis of how Microsoft lost its way with Windows 8 this week.

All in all it sounds reasonable to me. His recollection of DOS and some DOS version 8 confused me at first, but that was what the DOS buried in Windows ME was called. But mentioning it is appropriate, because it shows how DOS faded from center stage to being barely visible in the end, to the point where it was difficult to dig it out, and that it took 15 years for it to happen. He’s completely right, that if Microsoft had pulled the plug on DOS in 1985, Windows would have failed. Read more

Dave Farquhar

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How the IBM PC became the de facto standard for desktop computers

Dave Farquhar Retro Computing May 4, 2013May 1, 20251980s, 1990s, Ad Lib, amiga, apple, atari, atari st, compaq, Creative Labs, Digital Research, excel, IBM, intel, motorola, radio shack, Steve Jobs, Tandy, tandy 1000, Texas Instruments, TI, VGA

I saw a question on a vintage computing forum this week: How did the IBM PC become the de facto standard for PCs, and the only desktop computer architecture from the 1980s to survive until today?

It’s a very good question, and I think there were several reasons for it. I also think without all of the reasons, the IBM PC wouldn’t have necessarily won. In some regards, of course, it was a hollow victory. IBM has been out of the PC business for a decade now. Its partners Intel and Microsoft, however, reaped the benefits time and again.

Dave Farquhar

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Gary Kildall and what might have been

Dave Farquhar Retro Computing August 8, 2012February 21, 20221980s, Bill Gates, columbia missourian, Digital Research, Gary Kildall, IBM, public domain, SCO, tinkerer, unix

I didn’t have time to write everything I wanted to write yesterday, so I’m going to revisit Bill Gates and Gary Kildall today. Bill Gates’ side of the DOS story is relatively well documented in his biographies: Gates referred IBM to Gary Kildall, who for whatever reason was less comfortable working with IBM than Gates was. And there was an airplane involved, though what Kildall was doing in the airplane and why varies. By some accounts he was meeting another client, and by other accounts it was a joyride. IBM in turn came back to Gates, who had a friend of a friend who was cloning CP/M for the 8086, so Microsoft bought the clone for $50,000, cleaned it up a little, and delivered it to IBM while turning a huge profit. Bill Gates became Bill Gates, and Kildall and his company, Digital Research, slowly faded away.

The victors usually get to write the history. I’ve tried several times over the years to find Kildall’s side of the story. I first went looking sometime in 1996 or so, for a feature story about Internet misinformation I wrote for the Columbia Missourian‘s Sunday magazine. For some reason, every five years or so I end up chasing the story down again.
Read more

Dave Farquhar

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The CP/M-DOS forensics don’t prove much

Dave Farquhar Retro Computing August 7, 2012January 10, 2025atari, Bill Gates, Digital Research, Gary Kildall, Jerry Pournelle, john c dvorak, pc magazine, QDOS

I saw the headline on Slashdot: Forensic evidence trying to prove whether MS-DOS contained code lifted from CP/M. That got my attention, as the connection between MS-DOS and its predecessor, CP/M, is one of the great unsolved mysteries of computing.

Unfortunately, the forensic evidence doesn’t prove a lot.

Dave Farquhar

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SCO v. IBM winds toward resolution

Dave Farquhar Linux, Retro Computing February 18, 2012October 30, 20181990s, AIX, AT&T, BSD, Digital Research, Gary Kildall, IBM, intel, SCO, unix, x86

Slashdot reported yesterday that SCO v. IBM is back on. Well, it is, sort of. The case never was fully resolved, due to SCO running out of money and filing for bankruptcy. Groklaw has the details.

If this sounds vaguely familiar, I’ll try to refresh your memory.

Dave Farquhar

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A snapshot in history of Gates and Microsoft, 1992

Dave Farquhar Software July 5, 2011March 25, 20251990s, altair, Andy Grove, apple, Apple Macintosh, Bill Gates, DEC, Digital Research, IBM, intel, macintosh, Microsoft Office, Paul Allen, Steve Ballmer, windows me, Windows XP

Hard Drive: Bill Gates and the Making of the Microsoft Empire is a 1992 autobiography of Microsoft co-founder Bill Gates. It’s old. But it’s a compelling snapshot of what the industry thought of Gates and Microsoft before Windows 95, before Microsoft Office, and before Internet Explorer. Indeed, it gives an early glimpse into the struggle to bring Windows to market, some of the bad bets Microsoft cast on its early productivity software, and just how close Microsoft came to betting the company on the success of the Apple Macintosh.

If Microsoft’s history were written today, many of these stories would probably be forgotten.

Dave Farquhar

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Windows, ARM, emulation, misconceptions and misremembered history

Dave Farquhar Hardware May 22, 2011January 23, 20221980s, 1990s, 6502, amiga, android, apple, atari, atari st, Bill Gates, commodore, Digital Research, excel, IBM, intel, macintosh, Microsoft Basic, motorola, netbooks, Once Windows, unix, web os, windows 2000, windows 7, windows 8, windows nt, Windows XP, x86

I keep reading stuff about Windows and ARM and, well, I think people just aren’t remembering history.

I’m not saying that Windows 8 on ARM will save the world, or even change it substantially. It probably won’t, since Microsoft tends not to get things right the first time. But will I automatically write off the project? No. It could prove useful for something other than what it was originally intended. That happens a lot.

But I’m more interested in clearing up the misinformation than in trying to predict the future.
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Dave Farquhar

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Reactions to Allen’s memoir. And my reactions to them.

Dave Farquhar Retro Computing April 1, 2011January 2, 20251990s, 6502, altair, apple, apple ii, Digital Research, Gary Kildall, IBM, Microsoft Basic, out of the blue, Paul Allen

I hate April Fool’s Day. So nobody thinks this is an April Fool’s joke, I’ll just write more about what I wrote about yesterday, concentrating on media reactions to Paul Allen’s memoir. Then, tomorrow, I’ll revisit a very serious, important topic. Read more

Dave Farquhar

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