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Inside each v?bin_3.5.zip you will find ZIP files for each of the possible consoles: ANSI, WYSE, CVDU, or VGA3. One level deeper inside, there are binaries for each possible size of ROM chip: 64k, 128k, or 256k.
Source code for all of the above binaries is here: :software:firmwareos:sbc-188:source_3.5.tar.gz
And once again, here is the distribution of the great-grandfather of all the mystery games, ADVENTURE.
The utility program FDISK86.EXE may also be of interest.
An excellent source for vintage DOS operating systems is the WinWorld Library.
I have run MSDOS 5.0, MSDOS 6.22, PCDOS 2000 (7.0). I know of others who have had success with FreeDOS, also.
NOTE: PCDOS comes with the E.EXE editor, which is the first WYSIWYG editor which runs on the VGA3.