Microsoft MS-DOS 1.25 (Zenith Z-DOS 1.01) and utilities
Released in 1983 by Zenith/Microsoft
For the Zenith Z-100 computer

This archive contains MS-DOS 1.25, rebranded as "Z-DOS" for the the 
Heath-Zenith Z-100 computer. It also includes the diagnostic disk, 
and customer demo disk. Note, these will not work on IBM PC 
computers, emulators, or later IBM PC compatible Zenith machines. 
This archive contians imagedisk images of each disk. Use imagedisk on 
a PC to re-create each disk.

Zenith was not very specific with its version numbering. The
following are details from the files.

The Z-DOS disk contains:
BIOS: Rel 1.00 ver 1.10 (4/15/83)
DOS: MS-DOS release 1.01, version 1.25 (1/31/83)
COMMAND: Z-DOS/MS-DOS Command release 1.00, version 1.20 (1/25/83)

The customer demo disk contains:
BIOS: Z-DOS/MS-DOS BIOS release 1.00, version 1.00 (9,121, 8/27/82) (original release)
DOS: Z-DOS/MS-DOS release 1.00, version 1.25 (6,220, 6/24/82)
COMMAND: Z-DOS/MS-DOS Command release 1.00, version 1.19 (4,970, 7/14/82)

The command.com versions do not correspond with Microsoft's 
command.com version history. This suggests that Zenith bumped the 
version numbers separately on their own.
