PDP11 I/O page memory map

Noel Chiappa jnc at mercury.lcs.mit.edu
Thu Mar 1 20:54:50 CST 2018

    > From: Charles Dickman

    > So if the I/O page is completely (all processor modes) unmapped is
    > there any way to recover besides a power cycle? Does the RESET
    > instruction disable the MMU?

Interesting questions!

The CPU manuals don't say, about the RE$ET; I just tried it on the /23 I
happen to have next to my desktop, and yes, the RESET instruction does clear
bit 0 of SSR0.


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