need a map through the MSV11 Qbus memory jungle

From: Andreas Freiherr <Andreas.Freiherr_at_Vishay.com>
Date: Wed May 22 04:31:46 2002

Gunther,

maybe your 11/03 has a refresh problem:

> M7944 MSV11-B Q 4-Kword 16-bit MOS RAM (external refresh)

I seem to remember that the M8044 modules do their own refreshing, while
older boards like the M7944 need refresh via Q-bus, either from a TEV11
or from the CPU. Refreshing both internally (on-board the M8044) and
externally (through Qbus) is probably not a valid configuration.

Can you look up which board is at the far end of your Qbus? - Maybe the
jumper to fiddle with is there, and certainly the description is in the
LSI-11 Systems Service Manual on my shelf.

--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com
Received on Wed May 22 2002 - 04:31:46 BST

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