You can use a dual and quad together in place of a hex.
Paul
On Thu, Jul 19, 2012 at 2:06 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Hi everyone,
I'm getting ready to see if I can get all those PDP-11's running
properly. I have most of the test equipment I'm likely to meet -
multimeter, oscilloscope, current tracer, logic analyzer - but figured
that extender cards for Qbus and Unibus might come in very handy. Does
The same extenders work for Unibus and Qbus, and indeed Omnibus (PDP8/e,
etc) and several otehr things. They're jsut straingth-through tracks to
conencotr blocks.
You need (at least) a hex-height and a quad-height one. Dual height is
useful too. My set is _not_ up for grabs :-)
Be warned that some machines (the 11/44 sprigns to mind) behave oddly if
soem of their PCBs are put on extnders. I can't rememebr if it's a delay
or noise/coupling problem (probably ythe latter), but I was led a merry
dance when I was trying to sort out the cache in my 11/44 and only after
a lot oftets did I realise this darn thing won't work if the cache board
is on an extender.
If you can;t find the extender boards, the well-known trick of soldering
wires to the points of interest, putting the PCB back i nthe machine,
powering up, and probing the ends of the wires works fine in a lot of
cases. It's slower than using the extender, of course.
-tony