Donated to the "SIG/M" CP/M User's Group by Kelly Smith
This is an extensive diagnostic for the 8080 and 8085 CPU, and
exercises most functions of the processor. This diagnostic is
NOT for the Z80, but may be modified as required to handle the
incompatible "Sign/Parity Flag Bit". This diagnostic was
especially helpful in tracking down problems I encountered with
early production run's of the NEC 8080 which exhibited problems
with the "Aux Carry Flag Bit" when doing "DAA's".
A succesful run of the program will display the following
message:
CPU IS OPERATIONAL
an unsuccesful run of the program will display the following
message:
CPU HAS FAILED! ERROR EXIT=NNNN
Where "NNNN" is the address location AFTER the test failure.
The CPUDIAG.PRN file may then be referenced as to the address
location "EXIT" of the failure, to determine the exact nature
of the problem. Error address's were not included in the ".DOC"
file, because the program is typically relocated in PROM for
system diagnostic purposes. The program has however been
CP/Mified to run as a ".COM" file, with BDOS calls for console
I/O.
This program also serves as a very good "tutorial aid" when
traced with Digital Research's DDT or SID, to gain a better
understanding of register manipulation and arithmetic processes
of the 8080 and 8085 CPU.
Kelly Smith, Microcosm Associates
3055 Waco Avenue
Simi Valley, California, 93065
(805) 527-9321 (Modem, CP/M-NET)
(805) 527-0518 (Verbal)
