TABLE D–6 Keyboard/Mouse and Serial Ports A&B Signal Descriptions (continued)
Signal Descriptions
KeyBoardIn Input From Keyboard
XmitDataA Transmit Data Port A
RecDataA Receive Data Port A
RTS A Request to Send Port A
CTS A Clear to Send Port A
DSR A Data Set Ready Port A
DCD A Data Carrier Detect Port A
DTR B Data Terminal Ready Port B
DCD B Data Carrier Detect Port B
CTS B Clear To Send Port B
XmitData B Transmit Data Port B
TRxC A Transmit Clock (Receive) Port A
RecData B Receive Data Port B
RTxC A Secondary/Transmit Clock (Receive) Port A
TRxC B Receive/Transmit Clock Port B (Pullup)
RTS B Request to Send Port B
DTR A Data Terminal Ready Port A
TxC A Transmit Clock Port A
TxC B Transmit Clock Port B
Note - TRxC A and TxC A are connected to the same pin, since that pin is
bidirectional.
Signal Descriptions 193
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