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Apple LaserWriter Serial pinout

connector wiring scheme

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25 pin D-SUB female connector layout
25 pin D-SUB female connector

Pin Name Dir Description
1GND---Ground
2TXD--->Transmit Data
3RXD-<--Receive Data
4RTS-->Request To Send
5CTS<--Clear To Send
6DSR<--Data Set Ready
7GND---Ground
8DCD-->Data Carrier Detect
20DTR--->Data Terminal Ready
22RING<--?
Note: Direction is Printer relative Computer.

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25 pin D-SUB male connector layout
25 pin D-SUB male connector
Pinouts.ru > Some peripheral devices pinouts > Pinout of Apple LaserWriter Serial and layout of 25 pin D-SUB female connector and 25 pin D-SUB male 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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