MS-DOS 2.0 on the Apple IIe

Seth Kushniryk has been porting MS-DOS 2.0 to the Apple IIe using the AD8088 Plus coprocessor card. It’s an 8088 CPU on an expansion card with its own RAM and ROM. The card shipped with CP/M-86, available from nanja.info.

The original ALF advertising materials suggest there may have been an MS-DOS port at some point (they write about it in future tense, so I don’t know if it ever actually happened), but the original OS disks aren’t shared to any of the usual places. I decided to start my own port because I like directories and object-oriented Turbo Pascal, neither of which CP/M-86 supports. Today I got it to boot.

The Apple II bridge loads IO.SYS and MSDOS.SYS into 8088 RAM, then hands off to the 8088. The BIOS reads the BPB from the disk image boot sector, SYSINIT prints the copyright, COMMAND.COM loads and prompts for the date and time.

Check it out in the post here.

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