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Code Block
titleRST 20H, DEFB $72
IN:  -

OUT: Fc = 0, always and
     -  OUT:      A = last error code
     B = resumption cycle     B C = dynamicresumption idcycle
     IX = reserved      FcC = 0,dynamic alwaysid

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

Notes

Internal operating system usage. BC, IX are reserved for future use.

Related system calls

GN_Err, display an interactive error box
GN_Esp, return an extended pointer to a system error message
OS_Erh, set error handler
OS_Esc, examine special condition