19 Feb
2025
19 Feb
'25
1:19 p.m.
On Feb 19, 2025, at 4:08 PM, Gary Grebus via cctalk
<cctalk(a)classiccmp.org> wrote:
On 2/17/25 12:30, Chuck Guzis via cctalk wrote:
Apart from the obvious memory store operation, a subroutine call (RJ instruction) does a
memory write.
paul
One of most ingenious coding tricks to me was the
problem of saving and
restoring all registers without resorting to an exchange jump. We used
that one as a test for applicants.
Argh... I know I've seen this trick, but it's been too many years. How about a
hint?