C70:info-cpm (06/12/82)
>From ucivax!csuf!bruce@Ucb-C70 Fri Jun 11 20:34:18 1982
Well, I've finally found the REAL cause of the 'bug'... I have a Bitstreamer
board that I use to talk to my modem and 68000 board. I had installed the
interrupt-enabling jumpers on the board, as directed by the manual, but was
not actually using the interrupts. Well, when I thought I had solved the
problem by swapping Z-80 chips, I had not plugged in the Bitstreamer board
while I tested the system, since the board kind of hides the CPU board, and
if I was going to have to remove the CPU board again, I didn't want to have
to remove the Bitstreamer too. Well, I've learned my lesson (again!) about
never testing a change in hardware without setting up identical conditions...
anyway, when I ripped out all of the interrupt jumpers from the Bitstreamer,
the problem went away for good. Has anyone experienced a similar problem with
the Bitstreamer? I WOULD like interrupts from this board - but NOT if it is
going to screw up DDT......
Bruce Robertson
ucivax!ucbvax!csuf!bruce