12 Dec
2005
12 Dec
'05
8:41 p.m.
On Dec 12 2005, 15:03, Allison wrote:
The BA23 came with a microPDP-11 backplane or one for
the uVAX-II.
While the differences are small when used with care they are
differnt.
For the PDP-11 use the MicroPDP11 backplane is desired
as the uVAX
one has three slots that are CD wired for PMI bussed memory.
the DISK interface and distribution board in the back of the drive
cavity however are the same.
All the ones I've ever seen in the field are the same regardless of
whther for microPDP-11 or microVAX. I can't see why the microVAX one
would be different; the microPDP has the CD slots for PMI but the
microVAX doesn't care -- it uses over-the-top connections for the
memory.
The BA23 backplane for a microPDP-11 is an H9278-A and does indeed have
three slots Q22-CD followed by five serpentine Q22-Q22. That's the
same as my microVAX. And that agrees with the Tech Manuals I have.
--
Pete Peter Turnbull
Network Manager
University of York