On 2/19/25 17:38, Chuck Guzis via cctalk wrote:
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?
It uses the RJ instruction to record register content, bit-by-bit.
Think about it--RJ is about the only instruction that can modify memory
without fiddling with the A6 and A7 registers.
Of course... I vaguely recalled there was a bit-by-bit save, but didn't
think of the RJ. Thanks.
Gary
