Editing Apple LaserWriter II NTX (section)

== Ports and switches ==
The RS-422 (mini DIN-8) and RS-232 (DB-25) pin-outs are the same as the II NT's and are tabled on [[Apple LaserWriter II NT#Ports and switches|that page]].<ref name="asg" /> The NTX has a six-way DIP switch bank. Switches 1 and 2 set the port, 3 and 4 the command mode, and 5 and 6 the serial handshake.<ref name="asg" />

{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''LaserWriter II NTX switch settings (Apple Service Guide, Tab 6 p. 9)'''
! Setting !! 1 !! 2 !! 3 !! 4 !! 5 !! 6
|-
| LocalTalk (switches 3-6 not used) || Up || Up || || || ||
|-
| 1200 baud RS-232 and RS-422 || Down || Up || || || ||
|-
| 9600 baud RS-232 and RS-422 || Up || Down || || || ||
|-
| 9600 baud RS-232 || Down || Down || || || ||
|-
| PostScript batch || || || Up || Up || ||
|-
| Diablo 630 || || || Down || Up || ||
|-
| PostScript interactive || || || Up || Down || ||
|-
| HP LaserJet || || || Down || Down || ||
|-
| X-On/X-Off || || || || || Down || Down
|-
| X-On/X-Off || || || || || Up || Up
|-
| ETX/ACK || || || || || Down || Up
|-
| Data Set Ready || || || || || Up || Down
|}
<ref name="asg" />

The 1990 owner's guide warns against changing the printer from AppleTalk to serial mode while it is connected to a LocalTalk network. In serial mode the printer can send serial data onto the network and damage both. Disconnect the network or disable the printer's RS-422 port first, and never re-enable the RS-422 port while the printer is in serial mode.<ref name="og1990c">''LaserWriter IINT/NTX Owner's Guide'' (1990), Appendix C, Preventing damage when switching between hardware operating modes, p. 140 (PDF p. 156).</ref>

=== Printer hard disks ===
Apple's procedure for a dedicated font disk:<ref name="asg" />
# Switch off the printer and the disk.
# Connect a SCSI peripheral cable from the NTX to either SCSI port on the disk and fit a terminator to the disk's other port. For several disks, put a terminator at the printer end of the first cable and at the last disk.
# Give each disk a SCSI ID from 1 to 6 not used by another disk.
# Switch the disks on at least 10 seconds before the printer, or the NTX will not see them.
# Initialise the disk with Initialize Printer's Disk in the LaserWriter Font Utility, and download fonts with Download Fonts in the same program.