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Register parameters

Code Block

language	none
title	RST 20H, DEFW DEFB $30

IN:
     IX = stream handle

OUT, if call successful:
     Fc = 0, input MAY BE available

OUT, if call failed:
     Fc = 1
     A = error code:
          RC_EOF ($09), OS_In will not return immediately if called
          RC_HAND ($08), bad handle

Registers changed after return:
     ..BCDEHL/IXIY same
     AF....../.... different

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