On Wed, 24 Sep 2003, Doc Shipley wrote:
> OK. So the rearmost connector in the rackmount chassis is the A
> connector?
I cant remember for sure, but, yes, if that is where the term is
drawn or present, that is AB. We dont want a term in EF :)
> OK. Sanity check. A slot with an adapter using DMA needs the NPG
> grant line *removed*, and if the board in place needs it in place. Does
> breaking the NPG grant for a DMA adapter break the grant for succeeding
> cards?
Check succeeded.
> Maybe I need more info here, concerning the UDA50. I did find the
> UDA50 manuals - do I need more than that?
Nope, that is it... they will tell you how to install the thinginto a
system, which will include any NPG tinkering.
> Cool. Assuming access to needed storage and communication, are there
> any significant pros or cons to running it in a QBus system, as opposed
> to Unibus?
Qbus is slightly slower than Unibus. Other than that, Unibus periphs
are older, and, given technology, usually a bit larger than their Qbus
variants.
> And, does that mean that all the 4x4 slots in the system chassis are
> Qbus, as in I can run an RQDX3?
Although that is not what the Qbus part in the system was for (yes,
those indeed are all Qbus Q22 slots, I assume slots 1-3 are Q-CD,
slot 4 is Q-Q) there is no reason why this should not work.. I
have seen an 11/84 which had a TQK50 controller to boot and
install an OS, simply because its Unibus tape controller was
hosed at the time.
Cheers,
Fred
--
Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist
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Email: waltje_at_pdp11.nl BUSSUM, THE NETHERLANDS / Sunnyvale, CA, USA
Received on Wed Sep 24 2003 - 18:35:42 BST