Model 100 Serial Interface

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Configuration

Serial Word Format

Port $D8 controls the serial word format.

Bit Function Note
0 Stop bits 0 => 1 stop bit; 1 => 2 stop bits
1 Parity 0 => Odd parity; 1 => Even
2 Parity Inhibit 0 => Parity; 1 => No parity
4-3 Character length selected # bits: 00b => 5, 01b => 6, 10b => 7, 11b => 8
7-5 Unused

Baud Rate

Data Transmission

Data Reception

I/O Map

NameDirectionPort
TX Output $C8
RX Input $C8
RTS Output $BA, bit 7
CTS Input $BB, bit 4
DSR Input $BB, bit 5
DTR Output $BA, bit 6

Direction indicates both data flow, and whether to use an IN or OUT instruction to read/write to the given pin.