BA23 Box with RLV11 (Was: 11/23+ box with Microvax Memory)
Jerome H. Fine
jhfinedp3k at compsys.to
Tue Mar 8 06:41:06 CST 2016
> I see on the usual site, an 11/23 box with a couple of random boards,
> one of which is an M7608 board. This is a Microvax memory board.
> I wonder if one can build up a Microvax in that backplane, or if that
> is not recommended. It would obviously be an 18 bit backplane. The
> backplane is H9276A.
> The auction also has a M9047 Bus grant card in it, so is essentially
> just the box. But I'd never seen Microvax parts plugged into those
> backplanes, and it made me think.
Probably not as unexpected, but just as unusual in my mind:
I once saw a BA23 box with an M8190-AB (PDP-11/73) CPU
in slot 1 followed by an RLV11 (M8013 / M8014) in slots 2 / 3
connected to an RL02 drive. Usually, by the time a system
had a PDP-11/73 board, a couple of MB of memory and an
RL02 drive, the RL02 controller was upgraded to an RLV12
(M8061) board. NOTE that slots 2 / 3 had to be used for
the RLV11 since they were the only 2 slots left with ABCD.
Placing the RLV11 in any other position in a BA23 box lets
out the magic smoke.
As a bit of additional information, the other 5 slots were used
to hold the memory and other modules that were required. There
did not seem to be any problem with the memory being placed
in slot 4.
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