Specifications

CHAPTER 1
Overview of LaserWriter Pro Hardware
Communication 7
Table 1-4 Signal descriptions for Centronics parallel port
Pin
number Signal name Description
1 /DATA STROBE Strobe for input data
2 DATA 1 Data input bit 1
3 DATA 2 Data input bit 2
4 DATA 3 Data input bit 3
5 DATA 4 Data input bit 4
6 DATA 5 Data input bit 5
7 DATA 6 Data input bit 6
8 DATA 7 Data input bit 7
9 DATA 8 Data input bit 8
10 /ACKNOWLEDGE Handshaking output signal; acknowledges receipt
of data
11 BUSY Busy output signal; indicates that a /DATA
STROBE has been received, but that /
ACKNOWLEDGE has not yet been given
12 PAPER ERROR Output status signal. Indicates a paper error
13 SELECT OUT Daisy-chained printer select signal; not used in the
LaserWriter Pro printer, which is always selected
14 AUTO FEED Indicates that paper should be fed automatically
at the end of each line; not used in PostScript
printers
15 SELECT IN Daisy-chained printer select signal. Not used in
the LaserWriter Pro printer, which is always
selected.
16 SIGNAL GROUND Signal ground
17 CHASSIS GROUND Chassis ground
18 Not used Not used
19-30 SIGNAL GROUND Signal ground
31 /PRIME Reset signal. Host asserts it to cancel the current
job on this port.
32 /FAULT Fault signal. Asserted if there is any printer
problem that prvents printing, such as a paper
jam, or out of paper error.
33-36 Not used Not used