PDP-11 QBUS module ordering in BA23

From: Fred N. van Kempen <waltje_at_pdp11.nl>
Date: Fri Jan 9 16:30:49 2004

On Fri, 9 Jan 2004, Christopher Cureau wrote:

> Starting with the 3 Q/CD slots on top, then the 5 Q/Q slots:
>
> |------------------------------------------------------------------
> | M8190-AB (quad height) | |
> |------------------------------------------------------------------
> | Clearpoint QRAM 44B | M9047 ??? |
> |------------------------------------------------------------------
> | M8020 (DPV11) | M9047 ??? |
> |------------------------------------------------------------------

This then wont work, since the QRAM and/or M9047 (grant?), as well
as the M8020 all need Qbus.

I usually put the CPU in slot 3, then move downward since those
are all Q/Q. If you use slots 1-3, put the CPU in slot 1, and
for slots 2 and 3, only use the A/B parts (the leftmost sides
in your drawing.), since those are Q.

Also, I would move the DELQA up in the bus, since it (a) will
loose packets, and (b) acts up every now and then.

--f

-- 
Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist
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Email: waltje_at_pdp11.nl     BUSSUM, THE NETHERLANDS / Mountain View, CA, USA
Received on Fri Jan 09 2004 - 16:30:49 GMT

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