NaBloPoMo – DEC Micro PDP-11/23+

Ack!!!  Vox ate my post.  So first some text and I will add the links and pics later. Anyway another PDP11.  This time a Micro 11/23+.  The + is for 22 bit addressing.  The original 11/23 came out in 1979 with 18 bit addressing.  The plus version was a bit later.SO I am not exactly sure how old this one is so lets say circa 1980.

The PDP 11/23 was a QBUS computer.  The QBUS was a lower cost bus compared to the Unibus.  It did not have separate memory and address lines etc.  The QBUS was utilized on the DEC PDP 11/03, 11/23, 11/23+, 11/53, 11/73, 11/83, and 11/93.  It was also utilized on various microVaxen.

Anyway,  this one consists of a BA23 chassis, KDF11-BA cpu board, RQDX3 drive controller,  3rd party memory (whopping 256 kilobytes), RX33 floppy and yes a 3.5 inch floppy.

The front panel is homemade.  It is part of the BA23 covering and an old style rack panel combined.

I wish I could say it was fully functional,  but it appears the 20 meg hard drive has finally died.  And this was the one with Adventure/ Colossal Cave on it!!!!!  Anyway,  I guess I need to look up error 15.

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2 Responses to NaBloPoMo – DEC Micro PDP-11/23+

  1. Lurkertype says:

    you are in a maze of twisty little passages…luckily our non-working DEC equipment and manuals thereof fetched us a tax deduction for donating it to the Computer History Museum.

  2. Lord Kalvan says:

    I have yet to make it to the Computer History Museum. The hours are compatible with the hours I work when I am out in the valley. Anyway, I hope to get the 11/23 back to life. Just have to dig through a stack of Seagate drives and find one which works.

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