PDP-11/73 booting!

[Pete Turnbull]

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