20 Mar
2014
20 Mar
'14
12:25 a.m.
On 3/19/2014 11:44 AM, azd30 wrote:
Hi,
The QBus field guide is pretty specific when it comes to the M7609, but rather terse when
it comes to the M7621 description. Reading through the KA630 and 650 CPU module
user's guides, it seems both CPU's communicate with RAM via CD and the 50 pin
ribbon cable.
Is the main difference between the uVax memory boards just access speed, or are they
matched by design to the various CPU's?
ie. can an 8Mb board from a KA650 CPU be used with a KA630 CPU?
thanks
--
alex
I seem to recall that the physical positioning of the 50-pin headers on
the KA650 and KA630 module (and their associated memory boards) are
different, so it's physically difficult to connect mismatched boards
(without rigging up a different cable). However, it's been awhile since
I've fooled with this. Based on this I'd wager that they're
incompatible but I can't say I have conclusive data/experience to back
this up.
(Compare the images at: http://hampage.hu/dr/kepek/ka650.jpg vs.
http://hampage.hu/dr/kepek/ka630.jpg -- the positioning of the 50-pin
header
- Josh
