Do-It-Yourself PDP-11 help!

From: Tom Peters <tpeters_at_mixcom.com>
Date: Tue Feb 15 07:33:37 2005

Line-Time-Clock, allow interrupts to occur 60 per second or 100 per second
or whatever-- it's for running a clock from the line voltage frequency- or
mains frequency, if you're in the UK.

At 01:01 AM 2/16/2005 +0000, you wrote:
>Hi all,
> I've got what I believe is a PDP-11/73 of some sort - it lives in a 5U
> 19" rack case with a couple of MFM hard disks, and appears to mostly be
> made of third-party bits.
>
>It *was* working but someone has removed the cards, and now I don't know
>which order they go in the slots. Perhaps if someone looks over what I
>have they can give me a bit of advice.
>
>I have (plugged into the machine when I got it):
>
>a KDJ-11A - I believe this goes in the top-left space, looking down into
>the sockets
>a Baydel B01076 card, with a couple of eproms, a console port, and a lead
>that goes to the front panel (more of which anon)
>a Fourth Generation Systems memory board, with 18 41256s on it (512kwords?)
>an RXV21
>an RLV12
>an SCD-DHV11 board
>the backplane is labelled "General Robotics Corp", and "P/N 027-0003-OC"
>
>a couple of other boards that weren't in the machine, which are:
>a WDC11-C board
>an M8044 memory board, 32Kx18 bit
>
>The little front panel has a key switch that switches the mains on and
>off, a reset button with a "DC ok" LED, a Run/Halt switch which is broken,
>and a three-position switch marked "L.T.C. on/off". With this switch up,
>the LED above it lights up. "Local Terminal Console" is my best guess so far.
>
>When I power the machine up, three of the diagnostic LEDs on the KDJ11-A
>come on, then go off after about 1/2 a second, leaving just D3 on - which
>appears to mean that it can't communicate with the SLU. Now, I'm guessing
>that means it can't see the serial console, which I believe is on the
>Baydel card.
>
>Do the cards need to go into specific slots on the backplane? If I google
>for anything in this machine I get lots of sites offering to sell me
>cards, but very little in the way of real information.
>
>Gordon JC Pearce.


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YESTERDAY PLEASE BRING IT BACK OR FURTHER STEPS WILL BE TAKEN.
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Received on Tue Feb 15 2005 - 07:33:37 GMT