OSBYTE &40

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OSBYTE &40 (64) Read modem handshake
 On entry: none
 On exit:  X=b7: -
             b6: -
             b5: -
             b4: BCD Back Carrier Detect
             b3: CD  Carrier Detect
             b2: RI  Ring Indicator
             b1: CTS Clear To Send
             b0: -
Merlin M2100 calls

Jgharston (talk) 14:10, 19 March 2021 (CET)