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Register parameters

Code Block

language	none
title	RST 20H, DEFW DEFB $72

IN:
     -

OUT:
     A = last error code
     B = resumption cycle
     C = dynamic id
     IX = reserved
     Fc = 0, always

Registers changed after return:
     ....DEHL/..IY same
     AFBC..../IX.. different

...