>> 861C power controller, and I think an H960 or whatever rack. OK, first off,
>> which power supply modules would go in the PSU and where? BTW, the 11/34A I
>
>IIRC it's one -15V,10A one (H754), two 5V,32A ones (H7441 IIRC), and an
>optional one which, if fitted at all, is normally either the +20V/-5V one
>for core memory or the battery backup interface one. Most machines only
>have the first 3 regulators fitted.
>
>I can't remember the order off the top of my head, but I can look it up.
Looking from back to front, i.e. with the box horizontal, power supply
nearest you, front panel furthest: H745 (-15V) on the far left; two H741
(5V) adjacent to the main transformer in the middle; core/battery/empty
on the right.
>> anyone have any spare RK05 packs? Fourth, this may be a dumb question, but
>> which way should the grant continuity cards face, i.e. should the fingers
>
>Actually, they're keyed and will only fit level if they're the right way
>round. But it's not that obvious where they are level.
Note: the above test is not reliable. I have at least one system unit for
which exactly the opposite is true: there is a continuous groove from D
to E (and not a keying ridge), but not from C to D. So, if the card is in
backwards, the deeper post-D cut sits against the CD boundary while the
shallow pre-D cut is in the groove, and the card is level. Conversely, if
the card is in correctly, then the shallow pre-D cut rests against the CD
boundary; the slot is deeper than that, so that if the card is pushed in
as far as it will go, it isn't level. Rather follow this:
>They go in with the traces on the left, as if they were on the solder
>side of the PCB.
(Left, looking from front to back; and they go in slot D, where A is
adjacent to the power supply and F adjacent to the front panel.)
While on the subject, most of the grant cards I have have a trace running
from DA2 off the edge of the card... ?
This might be a good time for me to ask whether any of the more
experienced people might look at, verify or criticize the diagrams I made
myself to identify Unibus and Qbus card connector pinouts. (I found it
remarkably difficult to find pinout information on-line for non-in/out
Unibus connectors, so I know the Unibus SPC diagrams are incomplete.)
Postscript versions; these are 'actual size', so that one can hold a card
against the diagram to quickly locate pins. (US letter size, but will fit
if centered on A4):
http://www.kw.igs.net/~schoedel/dec/bus/qbus.ps.gz (6K)
http://www.kw.igs.net/~schoedel/dec/bus/unibus-ab.ps.gz (5K)
http://www.kw.igs.net/~schoedel/dec/bus/unibus-cdef-spc.ps.gz (9K)
GIF versions, retouched a little to look better on-screen:
http://www.kw.igs.net/~schoedel/dec/bus/qbus.gif
http://www.kw.igs.net/~schoedel/dec/bus/unibus-ab.gif
http://www.kw.igs.net/~schoedel/dec/bus/unibus-cdef-spc.gif
xfig for the above and several other variations:
http://www.kw.igs.net/~schoedel/dec/bus/fig.tar.gz (52K)
Equivalent text 'diagrams':
http://www.kw.igs.net/~schoedel/dec/bus/u-diagram.txt
http://www.kw.igs.net/~schoedel/dec/bus/q-diagram.txt
--
Kevin Schoedel
schoedel_at_kw.igs.net
Received on Sun Sep 24 2000 - 22:33:08 BST
