> From: Mark Matlock > Any device which uses backplane pins BC1, BD1, BEl, BF1 or DC1, 001, > DEl, OF!
Those last are probably typos for "DD1, DE1, DF1". > Several other pins are also tied to ground on that connector such as > BC2, BJ1, and BT1. Yeah, those are all standard Q22 ground pins. > When I look at the Board connector B pin C side 1 (component side) the BC1 > pin is tied to ground. .. So it looks like if I simply cut the trace > between the BC1 finger and its connection to ground on the board it > would become Q22 compatible. > Is it that simple? That would be my take on it, yes. As Jerry Weiss mentions, since it's not a DMA device, once you do that, it should be Q22-capable; all QBUS devices are supposed (per the QBUS spec) to use BBS7, along with BDAL0-12, to listen for register accesses, so the fact that it's not listening to BDAL18-21 should not be an issue. (Odd factoid: various QBUS CPU's drive various combinations of BDAL13-21 during references to the I/O page; I forget the details off the top of my head, but Dave Bridgham and I were just looking at that.) Noel