Macintosh Laserwriter
Signal Mini-Circular 8 (DB-25) Signal
Name pin pin Name Comments
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No connection 1 GND Chassis Ground
GND 4 <-> 7 GND Signal Ground
RxD+ 8 <-> 7 GND Signal Ground
TxD- 3 <-> 3 Rx Macintosh data output:
Transmit data, negative going
Laserwriter data input:
Receive data
Hsk
Out 1 <-> 5,6,8 Power detection; ready signal
RxD- 5 <-> 2 Tx Laserwriter signal output:
Transmit data
Macintosh signal input:
Receive data, negative
going