23 Mar
2014
23 Mar
'14
5:11 a.m.
On Sat, Mar 22, 2014 at 7:02 PM, Vincent Slyngstad <vrs at msn.com> wrote:
Interestingly, the configuration with two 8/E boxes
does not seem
to be allowed. Perhaps 80 slots was just too much?
The BA8-A System Expander Box came with a single 20-slot OMNIBUS backplane,
but you could add (as a fully supported configuration) a BE8-A OMNIBUS
Expander, which added another 20-slot backplane and M935 bus jumpers, for a
total of 80 slots (six taken up by bus jumpers and cables).
Three systems I worked with were the 80 slot configuration. Two were
originally sold by DEC in that configuration, and one was field upgraded by
DEC.
It was not uncommon to see the BA8-A expander used with the PDP-8/A, though
any hex-width options had to live in the 8/A chassis, since the BA8-A only
accommodates quad width.
Eric