11 Apr
2010
11 Apr
'10
3:06 p.m.
Hi all,
I'm looking for details on a 4MByte QBus memory module made my
National Semiconductor. It doesn't have an NSxxx model number anywhere
on it, but is simply labeled 980110014-211. I've managed to work out
what many of the jumpers do, but a lot of them go straight into a
couple of PALs which I'd rather not need to reverse engineer. A manual
of some description would be nice although, failing that, even a
summary of the jumpers' functions would be great. Even a photo of a
similar module with a description of how it's set up would help at
this stage.
The main thing I need right now is how to configure the range of
addresses the module will respond to. It works fine on one machine
which has some memory on the CPU board, but another won't boot saying
that there's no memory at address zero.
Cheers,
--
Steve Maddison
http://www.cosam.org/