Exit after NMI

Hello All! I'm redoing TRDOS here... I decided to use the Magic button as a pause engage (just don’t bother me about /WAIT, that’s not the point). And now I’m thinking - through which address is it better to return control? For now, I’m thinking of recording at 4000h - EDh, 45h and after JP 4000h. But what doesn’t the software like more? - corruption of two bytes on the screen (and the screen can be 7) - use of acc. sis. lane TRDOS (and the program can kill TRDOS) - use the address before the stack (and the stack can be calculated byte-by-byte) * Original written in CODE.ZX *Copied to ZX.SPECTRUM *Copied to REAL.SPECCY Best regards, Evgeniy.