uVAX II Memory Board

From: Dave McGuire <mcguire_at_neurotica.com>
Date: Fri Feb 2 17:20:44 2001

On February 2, Jerome Fine wrote:
> I have an interesting question. Can this board be used as additional ram
> in a PDP-11? If so, how might it be done?
>
> I have a Qbus Memory board that must be from a uVAX II - M7609-AP
> with 288 (I hope I counted correctly) memory chips
> 4256L-15 8726255
> A 21-22422-42 R
> with the standard male 50 pin header at the top to be connected to a uVAX
> CPU.
>
> If my arithmetic is normal, does this make it an 8 MByte memory?

  It's an 8mb board, yes. And no, it won't work on a pdp11...the PMI
(Private Memory Interconnect) connector at the top of the board is how
it talks to the MicroVAX-II CPU, while [most] qbus pdp11 systems talk
to their memory via Qbus.

> I don't expect that anyone will want it, but if so, can I swap it for a regular
> PDP-11 Qbus memory of 4 MBytes?

  I doubt you'll have much luck with this idea...MicroVAX-II memory
boards are all over the place, while 4mb Qbus pdp11 memory bards are
getting hard to find.

  Sorry if I busted your bubble...

             -Dave McGuire
Received on Fri Feb 02 2001 - 17:20:44 GMT