C70:info-cpm (06/09/82)
>From ucivax!csuf!bruce@Ucb-C70 Wed Jun 9 00:15:50 1982
Well, I've fixed (if not solved) the problem... Prompted by an entry in this
list, I tried switching Z-80 processors. Lo and behold!! The Problem Of The
Lost Flags goes away! This is all very well, but then when I try the original
Z-80 in another machine (same board), it performs correctly! Where did the
Lost Flag problem go? Could dirty pins cause me to lose status flags while
tracing in DDT? Oh well, I'll file this one along with the other intermittent
problems I'm often plagued with.... ~sigh~
Bruce RobertsonC70:info-cpm (06/09/82)
>From POURNE@Mit-Mc Wed Jun 9 00:26:53 1982
For some months we had a gremlin here; sometimes, not too often,
when accessing files longer than 16K on CP/M, the system would
simply get lost and wander back to the monitor.
Larry Niven and I have identical systems.
Tony Pietsch simply swapped Z-80 chips between my
machine and Larry's. Both have worked perfectly ever since, a
matter of about 3.5 years since we opened the cabinets last.
Thus I believe that your problem went away when you
swapped chips...