RLV12 placement in H9278-A question

[tiggerlasv at aim.com]

On Feb-21-08 at 16:05:45, Jerome Fine wrote:

> If my memory serves me correctly (which is not very
> frequent these days), I seem to remember receiving
> a BA23 box with an M8189 in the top slot and the
> RLV11 in to next 2 slots.  The memory for the system
> (normal PDP-11 Qbus memory) was in slot 4.

> As far as I know, there might be a delay factor
> associated with placing the memory below the RLV11,
> but it still functions correctly.


It's entirely possible that it would work correctly.

Covention has always been that PMI memory immediately precedes
the CPU, and NON-PMI memory immediately follows the CPU.

I've always just assumed that there was a reason for it,
and never really questioned it, since I had no need to.

I'm surprised anyone would bother with an RLV11 in a BA23,
since the RLV12 was readily available at the time, and supports 22-bit.
Much less space, power, and heat.

Although sometimes you just have to work with what is at-hand.   ;-)




T
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