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.
--Devin On Sun, Mar 12, 2017 at 11:26 AM, Noel Chiappa via cctalk < cctalk@classiccmp.org> 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 >
