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6. Appendix Table 6.3. Function of Each Register < 4 / 4 > I/O address 03FEH Description MSR : Modem Status Register D7 D6 D5 D4 D3 DCD RI DCD 03FFH 76 D2 D1 D0 DSR CTS DDCD TERI DDSR DCTS RI DSR CTS Delta CTS Delta DSR Trailing edge RI Delta data carrier detect SCR : Scratchpad Register This is an 8-bit, readable/writable register which is available to the user to allow data to be saved temporarily. BX-220 User’s manual
