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Got a pdp 11/23

Posted: Sat Mar 11, 2017 11:32 am
by MrBill
Picked this up about a week ago, still getting it cleaned up.

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Also ASR33 teletype

Posted: Sat Mar 11, 2017 11:49 am
by MrBill
Oh, also a ASR33 teletype. Not exactly dec, but its going to be the main console for my 11/34, so its kinda relevant.

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Re: Got a pdp 11/23

Posted: Sat Mar 11, 2017 12:31 pm
by commodorejohn
Mmm, nice :)

Re: Got a pdp 11/23

Posted: Sun Mar 12, 2017 4:09 pm
by smj
Lucky dog! Looks like you've got a bit more than a plain 11/23 there. In fact, is that a pair of TU58 tape drives mounted in the top of the chassis, with a controller above the card cage? And what else is on that grey board with the i8253 timer?

I'll bet this system's got an interesting story to tell...

Re: Got a pdp 11/23

Posted: Sun Mar 12, 2017 5:26 pm
by MrBill
Contrary to what the pictures look like, i did not take a bite out of the corner O.o
The corosion is quite bad in the corner. Power supply is quite crusty as well. I am thinking about replacing the power supply with a modern atx variant with some over voltage protection, etc, to protect the boards better than that behemoth of a power supply.

that is the tape controller mounted above the card cage, correct. kinda an odd setup.
It does have 2 TU58 drives in it, although they need new capsans and i have no tapes. I fail to see the point though, it attaches via serial and can redially be emulated with a dos pc and a serial cable. I could do away with tape read errors all together. It just seems like a finicky tape setup from the get go to me. Maybe ill get the drives going if i can get a bunch of tapes for a good price. Again though, i have a 9 track tape drive in a full size rack over here that is known working and i can get the tapes for $15 a reel, ill stick with the known working drive in the rack for now.

The grey board is a boot board. looks home brewed. The machine was custom built in some university in Illinois, thats all the story i got on it. The seller said that there is a second machine just like it, i do not see myself needing another of this particular design. Quiet and tiny compared to the 11/34 rack.

Re: Got a pdp 11/23

Posted: Mon Mar 13, 2017 1:42 pm
by smj
Heh - I have a couple custom-built NS32k-based systems from the University of New Brunswick, Interesting design decisions all around. Lots of heavy gauge sheet steel, but very well-formed and nicely finished.