20 Jul
2010
20 Jul
'10
12:10 p.m.
On 20/07/2010 19:20, Scott M wrote:
My concern is that the 18-bit PDP 11/23 does not have
enough memory.
It currently has 128KB installed, with a maximum of 256K possible after a
memory board upgrade (M8067, MSV11-PK = 256KB). How far do you estimate I
can get with just 128KB memory? Can I get through Lions' book?
I am looking at adding wires to the backplane to make it a 22-bit machine,
and using a quad height qbus memory board, M7551 (available in 1MB, 2MB and
4MB sizes).
I forgot to mention one other web page:
http://www.dunnington.u-net.com/public/PDP-11/QBus_memory
lists most of the memory options in a table.
Specifically, I can tell you that an M8067 MSV11-PK, and an M7551
MSV11-Q are both OK in Q22-Q22 serpentine backplanes. For the MSV11-P
you need to ensure W1 and W2 are both in place to provide bus grant
continuity.
--
Pete Peter Turnbull
Network Manager
University of York