On 2/19/25 13:08, Gary Grebus via cctalk wrote: > On 2/17/25 12:30, 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. --Chuck
