From: utzoo!decvax!harpo!npois!ucbvax!C70:info-cpm
Newsgroups: fa.info-cpm
Title: NOT a DDT bug...
Article-I.D.: ucb.1328
Posted: Fri Jun 11 20:34:28 1982
Received: Sun Jun 13 02:15:43 1982

>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