PDP11 I/O page memory map

Noel Chiappa jnc at mercury.lcs.mit.edu
Thu Mar 1 06:15:57 CST 2018

    > On many of the PDP-11s that page is signified by asserting BBS7

QBUS machines only; the UNIBUS has no equivalent signal.

    > FYI the microPDP-11/53 is the 11/23+ cpu card

Err, no; according to the "MicroPDP11/53 System Supplement Manual"
(AZ-GPTAA-MC), pg. 3-1, the CPU card in the /53 is the KDJ11-D. The
/23+ uses the KDF11-B CPU card.


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