13 Feb
2003
13 Feb
'03
12:57 a.m.
Eric,
you're right: I checked the manual again, and found that the M9312 is
designed to work in either a standard Unibus or MUD slot. You only need
to remove jumper W-6 for MUD operation (to keep the buffered "VECTOR L"
signal away from the +5V battery backup power line).
I was blinded because I had never seen this module used at the far end.
In fact, if there is a bus repeater, the M9312 must be installed at the
CPU side of the repeater (says the manual).
In my 11/34A, leaving the M9312 at the CPU end makes connections to the
front panel simpler: the other end of the bus is in an expansion box,
separate from the box containing the CPU and the front panel.
BTW, somebody asked for pictures a while ago. Please visit
http://andreas.freiherr.bei.t-online.de/pdp-11/index.htm and have fun!
Regards,
Andreas
Eric Smith wrote:
An M9312 will work just fine in a normal Unibus slot
at the far end.
...
The near-end Unibus terminator slot is NOT an MUD slot. On an 11/44
it does have a few signals different than a normal Unibus slot, but
they are different than a MUD slot also.
--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com