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