LaserWriter: Connecting to Apple II or Apple III

This article has been archived and is no longer updated by Apple.


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
-----------------------------------------------
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)
----------------------------------------------
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
----------------
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

Published Date: Feb 19, 2012