OS_Erc, Get error context

Register parameters

RST 20H, DEFB $72
IN:  -

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

Registers changed after return:
     ....DEHL/IXIY same
     AFBC..../.... different


Internal operating system usage.

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

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