15 Jan
2008
15 Jan
'08
3:26 a.m.
On Monday 14 January 2008 22:02, Richard wrote:
In article <478C1B0E.8090407 at shiresoft.com>,
Guy Sotomayor <ggs at shiresoft.com> writes:
No. Every UNIBUS -11 has a custom CPU backplane to some extent.
The QBUS ones have a mostly common backplane (ignoring differences in
how many bits are wired on the address lines) mostly because the CPU
fits all one one board.
FWIW, UNIBUS is a bus, not a backplane type. A DD11 is pretty much the
only UNIBUS backplane that isn't custom to the device that's in it.
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
The 11/70 CPU is *not* a unibus backplane. It is
a *very* large
backplane that fills an entire BA11F.
Interesting, I just assumed it was unibus. Is the /70 the only
PDP-11 that has a custom backplane? I thought the PDP-11 family had
standard backplanes: unibus and Q-bus.