MS-DOS 1.0 was actually a renamed version of QDOS (Quick and Dirty Operating System), which Microsoft bought from a Seattle company, appropriately named Seattle Computer Products, in July 1981. The software build was done on 8" floppies and the binary (executable) files were then transferred to the IBM PC by serial cable. The actual port was done by a group of Irish programmers using Intel development systems, which ran the ISIS II operating system. In one single all-night session Jim Fox patched the CP/M-86 version of WordStar to make it run under MS-DOS on the IBM PC so that it could be demonstrated to Rubenstein. Sounds a bit exaggerated, found some WordStar history here Is this true or just a figure of speech? In the interest of my quest to become a "Real Programmer", what was the single byte change? Solution : I couldn't find any other references to this with a quick Google search. I was re-reading Joel's Strategy Letter II: Chicken and Egg problems and came across this fun quote:
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