12 Dec
2003
12 Dec
'03
4:31 p.m.
I recently found a cabinet with a MicroVAX II (in 2 BA23 enclosures) and
quite a lot storage devices on it. I plan to replace the MicroVAX II CPU
module (M7606-AA) with a pdp11/73 CPU module (M8192) . I only have a
512k RAM module (M8067LA) for the pdp11/73 . The microVAX has two quad
height memory modules , but I haven't checked yet whether they are 1, 2
,4 or 8 megs each (ie M7607,M7608 or M7609) .Is it possible to keep some
of the MicroVAX memory modules if they are below or equal to 4 megs?
12 Dec
12 Dec
5:23 p.m.
On Fri, Dec 12, 2003 at 06:31:12PM +0200, Christos Papachristou wrote:
Is it possible to keep some
of the MicroVAX memory modules if they are below or equal to 4 megs?
No. The uVAX memory requires special PMI stuff (carried over those
ribbon cables) that the PDP-11 CPUs don't grok. At least, that's
what I've always been told.
--
David Evans dfevans(a)bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo "Default is the value selected by the composer
Ontario, Canada overridden by your command." - Roland TR-707 Manual
13 Dec
13 Dec
1:56 a.m.
On Fri, 12 Dec 2003, David Evans wrote:
And that's correct.
The 11/73 require Q-bus memory. The only VAX that used this is the
MicroVAX I.
If the 11/73 really is a disguised 11/83 CPU, you can use the 11/83 PMI
memory, which don't work the same way as the VAX PMI.
(PMI by the way stands for Private Memory Interconnect)
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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2 comments
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participants (3)
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Christos Papachristou -
David Evans -
Johnny Billquist