6 Sep
2023
6 Sep
'23
7:44 p.m.
On Sep 6, 2023, at 3:00 PM, Mike Katz via cctalk
<cctalk(a)classiccmp.org> wrote:
Paul,
I'm not an 11 expert but don't most instruction fetches (or the last clock phase
on an instruction) cause the pc to increment by one?
No, by 2 because memory addresses are byte addresses but instructions are 2-byte words and
word aligned.
I just remembered two other PDP-11 trivia questions, not model dependent.
1. Describes a one-word program that executes backward in memory.
2. Describe a one-word program that clears the entire 16-bit address space, halting on
completion.
paul