C-3
Appendix C
Host Computer Interface
Interface Signals
The pins of the parallel interface connector carry the signals listed in Table C.1. Asterisks in the
table indicate signals that are active low. The table also indicates whether each signal is incoming
or outgoing with respect to the printer.
Table C.1. Parallel Connector Pin Assignments
Pin In/out Description
1 In Strobe* [nStrobe]
2 In Data 0 [Data 1]
3 In Data 1 [Data 2]
4 In Data 2 [Data 3]
5 In Data 3 [Data 4]
6 In Data 4 [Data 5]
7 In Data 5 [Data 6]
8 In Data 6 [Data 7]
9 In Data 7 [Data 8]
10 Out Acknowledge* [nAck]
11 Out Busy [Busy]
12 Out Paper Empty [PError]
13 Out On-Line (Select) [Select]
14 In Auto-feed [nAutoFd]
15 — Not connected
16 — 0V DC
17 — Chassis GND
18 — +5 V DC
(Continued on next page)
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