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Register parameters

Code Block

language	none
title	RST 20H, DEFW DEFB $45

IN:
     BC = enquiry code
     ADEHLIX parameters

OUT, if call succeeded:
     Fc = 0
     Depends on BC and other arguments

Out, if call failed:
     Fc = 1
     A = return code:
          RC_BAD ($04), incorrect reason code or parameters
          RC_UNK ($03), unknown request

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