XDOS

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[edit] XDOS: The Diagnostic and Bootstrap Program for the XXU

XDOS is a 64K Byte program stored on the XXU 68020 processor Card

The program was primarily written by Herb Lewis.

In previous Cromemco Systems a basic system would need at least a Floppy Disk Controller, a CPU Card and Memory. By including the diagnostic ROM on the XXU, it is the only card in the system that need be functional in order to run diagnostics. Any failure of the XXU card itself is indicated by a red, fault detect LED on the XXU card.