3 Nov
2024
3 Nov
'24
9:34 p.m.
On 2024-11-03 9:37 p.m., Tony Duell via cctalk wrote:
On Mon, Nov 4, 2024 at 4:06 AM Mychaela Falconia via
cctalk
<cctalk(a)classiccmp.org> wrote:
Where there any user instructions between models that gave strange
behavior on the wrong machine?
Paul Koning wrote:
Does that work on all models of PDP11?
I had an idea that (as in C) the order of the decrements and reads was
not specified by the instruction set definition and that on some
machines (the 11/45?) it doubly decrements PC before reading or
storing.
-tony 1. Show a one-word PDP-11 program that writes all
of memory, in reverse order.
MOV -(PC),-(PC)