Oldest Known Version Of DOS Unearthed - MS-DOS Ancestor 86-DOS Version 0.1c Is Now Available
Arthur T Knackerbracket has processed the following story:
An incredibly early release of 86-DOS has been found, imaged, and shared on the Internet Archive. The disk appears to be an original release of version 0.1 C of 86-DOS from Seattle Computer Products (1980) and includes several utilities, along with a game. Moreover, according to the disk label, what we see is just the eleventh disk off the duplication line. This is an important finding, as 86-DOS is a direct ancestor of PC DOS and MS-DOS.
Archive.org member f15sim shared the early 86-DOS disk image on the Internet Archive's site just ahead of the New Year. We even get to see a photo of the disk in its paper sleeve, where Serial #11" can be seen printed. Before this 86-DOS release was unearthed on its 5.25-inch floppy disk, the earliest version that had been saved for posterity was version 0.34.
[...] NTDEV highlights the Spartan nature of 86-DOS version 0.1 C. The OS is delivered as a floppy disk containing just nine files. The core OS standard COMMAND.COM was included, which interprets command line instructions like dir, copy, clear, and format. The disk also contained utilities for file and disk copying, a basic text editor, plus two or three development utilities.
The development utilities were important to 86-DOS releases as users would be short on software unless they sourced or translated existing 8-bit Z80 CP/M programs for the 8086 architecture. Thus, there was an assembly language program called ASM.COM, a code compiler app called HEX2BIN.COM, and a Z80 to 8086 translator dubbed TRANS.COM.
Last but not least, it is interesting to see that an OS as primitive as this release included a game. CHESS.COM was accompanied by instructions in CHESS.DOC, which would probably be essential reading on a no-graphics rendition of this complex strategic game.
To test 86-DOS yourself, you can grab the disk image directly from Archive.org and then follow the instructions provided here to get a working SIMH/AltairZ80 Simulator compatible with the disk image.
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