A LaserWriter, mode switch set to Special (Diablo 630 emulation), can be
connected to an Apple III or to an Apple II with Super Serial Card (SSC).
from Apple III or SSC to LaserWriter
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DB-25 connector DB-25 connector
signal - pin wiring pin - signal
Tx 2 <-> 3 Rx (Receive Data)
Rx 3 <-> 2 Tx (Transmit Data)
Signal Ground 7 <-> 7 Signal Ground
Apple II DIP Switch Settings (with SSC in DTE)
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Switch block 1 Switch block 2
1 off 1 on
2 off 2 off
3 off 3 off
4 on 4 off
5 off 5 off
6 on 6 off
7 on 7 off
The above setting result in:
9600 baud, printer mode
normal CTS
8 data bits, 1 stop bit
no delay after CR
132 characters/line
no line feed after CR
interrupts off
normal CTS
Apple III Driver
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Use the standard .PRINTER driver, which uses the built-in serial (RS-232C)
port. The five parameters to set in the driver configuration block are:
byte 1 (data rate) 0E = 9600 baud
byte 2 (data format) 00 = 8 bit, no parity
byte 3 (CR delay) 00 = no delay
byte 4 (LF delay) 00 = no delay
byte 5 (FF delay) 00 = no delay