Microsoft MS-DOS 1.25 (Z-DOS) (8-11-1983) [Zenith Z100]
Released in 1983 by Microsoft/Zenith
For Zenith Z-100 Series computers (Not the Z-100 PC Series)

This is Zenith's release of MS-DOS 1.25 for the Zenith Z-100 Series
computer (not IBM PC hardware compatible).

Important: This version of DOS will ONLY boot on a Zenith Z-100
Series computer (Models Z-110, or Z-120). This will *NOT* boot on an
IBM PC, clone, or emulator.

Note: The confusingly named later "Z-100 PC Series", that includes
models Z-150, Z-160, etc, are IBM PC hardware compatible, and will
also not natively run this software.

Note: There were several known minor updates to Z-DOS that are not 
identified by the label or fully identified by the printed version 
strings. The highest file date in this set is 8-11-1983, indicating 
it is a later release.

This version of Z-DOS contains:
Z-DOS/MS-DOS BIOS release 1.00, version 1.10
Z-DOS/MS-DOS release 1.01, version 1.25
Z-DOS/MS-DOS Command release 1.00, version 1.20

Zenith part number: OS-63-4