Reply to post: Re: Commodore

Microsoft liberates ancient MS-DOS source from the museum and sticks it in GitHub


Re: Commodore

Back in 1980, 86-DOS supported 1.25MB 8" DSDD floppies. Weirdest aspect was supporting double sided single density floppies as separate drives for each side.

Not surprised to hear about Paterson's code for the inner workings of MS-DOS 1.25 as I've read his code for IO.SYS used in 86-DOS 1.14 and MS-DOS 1.25. Another thing about Tim's code is that he paid attention to Intel saying DO NOT USE interrupts below 20H, unlike IBM/MS with the PC ROM based BIOS.

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