The following describes the connection between III E-Z Pieces on the Apple III and the LaserWriter.
I. Apple III:
A. Driver: .RS232
1. Data Configuration Block:
0 1 2 3 4 5 6 7 8 9 A B
-- -- -- -- -- -- -- -- -- -- -- --
0E 00 00 00 00 80 13 11 DF 84 50 00
No parity is set automatically in the Printer Mode.
II. The Connection
A. Connect Modem Eliminator Cable (Part #590-0166) to the
connector on the back panel of the Apple III.
B. Connect the Serial and Communications Cable (Part #590-0037) to
the connector on the Laserwriter.
C. Connect the remaining ends of the two cables together.
D. Here is a diagram of the connection:
Apple III LaserWriter
Back panel Serial Port
DB-25 connector DB-25 connector
signal - pin wiring pin - signal
Frame Ground 1 <-> 1 Frame Ground
Tx 2 <-> 3 Rx (Receive Data)
Rx 3 <-> 2 Tx (Transmit Data)
RTS 4 <-> 4 RTS (Ready To Send)
Signal Ground 7 <-> 7 Signal Ground
DTR 20 <-> 20 Tx (Transmit Data)
1. Set the Selector Switch on the LaserWriter to "Special". This can
be done without turning off the printer. In Diablo 630 emulation
mode the LaserWriter uses 9600 baud, XON/XOFF protocol, and no
1. To verify the connection, turn on the III, video monitor, and
LaserWriter. Boot III E-Z Pieces and choose "Other Activities"
from the Main Menu. Add a custom printer, naming it LaserWriter.
Use these settings for this custom printer:
1. Needs line feeds after each Return No
2. Accepts top-of-page commands Yes
3. Stop at end of each page No
4. Platen width 8.0 inches
5. Printer codes Yes
The printer codes for the Diablo Emulation are in the LaserWriter
Technical Description. If you specifiy no printer codes, the
typeface will default to Courier standard, 12 characters per
2. Return to the Main Menu and try to print a document.
3. Be aware that when you use the 3E-Z Pieces command OA-H (for hard
copy), you will have to print a document using OA-P before you
may use the OA-H command again. This is because the command OA-H
does not issue the form feed the LaserWriter needs to clear its
Diablo emulation settings.
Article Change History:
18 Oct 1994 - Reviewed for technical accuracy, revised formatting.
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