Aquired PDP 11/23

devin davison lyokoboy0 at
Sun Mar 12 15:00:30 CDT 2017

The thing on the top has to do with the tape drives, i think it is the
controller. the drives plug into it, and from there it wires into a serial
port, at least as far as i can tell. Much appriciated on the offer to trade
for the memory board.
It has been slow going with my 11/34, if i can get this machine going
first, i would like to image my rl01/02 disks and see if there is anything
interesting on them. Are dectape II tapes expensive? can you just format a
more common higher capacity tape down to the dectape II format? i have a
bunch of the newer cartriges, they do fit.


On Sun, Mar 12, 2017 at 11:26 AM, Noel Chiappa via cctalk <
cctalk at> wrote:

>     > From: Devin Davison
>     > This past week I managed to pick up a  pdp 11/23.
> Nice system; the CPU has the MMU and FPP, you've got what's probably a
> 256KB
> memory card (an NS23M - documentation is available - depending on the
> chips,
> it can be 64KB or 256KB - if the former, let me know, I'll swap you a 256KB
> one), and I think the pair of quad cards are probably an RLV11. Not sure
> what
> that off-brand dual card is - maybe a ROM of some sort?
> I wonder what the card on top in the chassis is? It looks like it has way
> too
> many chips on it to be just a power supply board - but I can't figure out
> what
> it could be. Anyone know?
>         Noel

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