Silicon Graphics CHALLENGE L, User Manual, Page: 37 / 164

Challenge Deskside System I/O Panels and Connectors
21
Parallel Printer Ports
The parallel printer port on the system I/O panel is a 25-pin, Centronics-
compatible connector. Table 2-4 shows the pin assignments and the signals
that they carry.
Note:
The optimum recommended length for a cable used with this parallel
port is 10 feet (3 meters). Maximum length should not exceed 20 feet
(6 meters).
To enable an additional parallel printer port on an optional IO4 installed in
your Challenge deskside, input the following:
% cd /dev
# ./MAKEDEV plp
These commands create the necessary device nodes required to use the
additional parallel port on an optional IO4. The
MAKEDEV command
automatically checks the hardware configuration of your Challenge and
makes parallel port device nodes for additional ports.
Table 2-4 Centronics Compatible Parallel Port Pin Assignments
Pin Assignment
1 STB (Data Strobe)
2 DATA 0
3 DATA 1
4 DATA 2
5 DATA 3
6 DATA 4
7 DATA 5
8 DATA 6
9 DATA 7
10 DATA ACK
11 BUSY