Seattle Computer Products 86-DOS 0.1 and 86-DOS 0.34 found

SomeGuy

Saw a post over on VCFED.org that several very early versions of 86-DOS have been found: https://forum.vcfed.org/index.php?threads/earliest-known-copies-of-86-dos.1246146/

From the pictures, they claim to be 86-DOS 0.1, and 86-DOS 0.34.

The downloads are posted on Archive.org
https://archive.org/details/86-dos-version-0.1-c-serial-11-original-disk

https://archive.org/details/86-dos-version-0.34-c-serial-221-original-disk

86-DOS is the OS that IBM PC-DOS and MS-DOS was based on. It was developed for the Seattle Computer Products 8086 based S-100 systems.

jonirob

86-DOS 0.11 running in the AltairZ80 simulator, it also includes a text only chess application.

SomeGuy

Just for some contrast, here are the same "DOS 0.1" applications running natively on Windows 10-32 bit. Remember, Windows 10-32bit can run DOS and 16-bit Windows 3.x applications.

The assembler didn't quite want to work, it complains about "no directory space". That is not something DOS programs normally check, so probably a compatibility issue.

BTW, I just picked these out of the disk image manually since the disk is in a completely different format.

ibmpc5150

Wow, this is great find! Thanks.

roytam1

and there is a IBM PC port there: https://forum.vcfed.org/index.php?threads/earliest-known-copies-of-86-dos.1246146/post-1360046
and a v2 version for making similar disk layout as original one: https://forum.vcfed.org/index.php?threads/earliest-known-copies-of-86-dos.1246146/post-1360552