23 Mar
2000
23 Mar
'00
1:46 p.m.
<> Or, wouldn't it work to just use a Q18
backplane which doesn't bus BDAL21
<> I would think that even the 11/73 CPU would be OK then, as long as you do
<> mind living with 248 KB memory...
<
<Or maybe you could put the CPU/RAM/DMA peripherals in a Q22 backplane and
<then link that to a Q18 backplay with the ADV11 card in it. If you like,
<you could connect BDAL18-BDAL21 between Qbus In and Qbus Out on that
<backplane, so that you could have more Q22 backplanes 'dowstream' of it.
You can but the collective system will be the least of the two and not
additive on items like address bus width. Likely that would have
wraparound if enough memory or a non BBS7 compatable IO. If a bord is
only Q16 or Q18 the options are mod it if possible for q22 or restrict
the bus useage to the level of the least board.
<Sigh> I think all this is a mote point. It's safe to say that I'll either
use them in a PDP-11/03 or a PDP-11/23 (of course I've never bothered to
get any of either working). Unless someone wants to trade a Q-22
compatible one (any size as I don't need 16-channels) for a pair of them.
Zane
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