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9 pin D-SUB male connector layout
9 pin D-SUB male connector
Pin Name Dir Description
1 GND --- Ground
2 n/c   Not connected
3 GND --- Ground
4 TXD+ --> Transmit Data +
5 TXD- --> Transmit Data -
6 n/c   Not connected
7 RXCLK --> TRxC of Zilog 8530
8 RXD+ <-- Receive Data +
9 RXD- <-- Receive Data -
Note: Direction is Printer relative Computer.
9 pin D-SUB female connector layout
9 pin D-SUB female connector
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Source(s) of this and additional information: Technote HW19: Pinouts at Apple Technical Notes, from Hardware Book
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