Specifications
2 - 15
Table 2-11. Parallel Printer Connector (J6)
J6
PIN
SIGNAL NAME FUNCTION IN/OUT DB25
PIN
1 -STROBE Output data strobe out 1
3 Data 0 LSB of printer data i/o 2
5 Data 1 : i/o 3
7 Data 2 : i/o 4
9 Data 3 : i/o 5
11 Data 4 : i/o 6
13 Data 5 : i/o 7
15 Data 6 : i/o 8
17 Data 7 MSB of printer data i/o 9
19 - ACK Character accepted in 10
21 BUSY Cannot receive data in 11
23 PAPER OUT Out of paper in 12
25 SEL OUT Printer selected in 13
2 -AUTOFD Autofeed out 14
4 -ERROR Printer error in 15
6 -INIT Initialize printer out 16
8 SEL IN Selects printer out 17
26 -POE Port output enable in --
10,12
14,16
18,20
22,24 GND Signal Ground --- 18-25
Printer Port Configuration
The jumper at W7 is provided to allow this port to be configured as either a primary or secondary
AT compatible printer port. The jumper must be set as indicated in Table 2-12. When shipped,
the board is configured for the primary option. In addition, the board's nonvolatile Configuration
Memory contains a parameter which can be used to disable the port entirely. Use the Ampro
SETUP utility to disable the parallel port, if desired.
Table 2-12. Parallel Printer Port Configuration
SELECTION I/O ADDR. INTERRUPT W7
“Primary” 378-37Fh IRQ7 open
“Secondary” 278-27Fh IRQ5 short
As seen in Table 2-12, jumper option W7 allows a choice of two I/O port addresses for the printer
port (378-37Fh or 278-27Fh).
Normally, DOS assigns the name "LPT1" to the primary device, and "LPT2" to the secondary
printer device (if present). However, a scan is made for both choices (primary and secondary) and
if only a secondary printer is detected, it will be assigned as the "LPT1". Therefore, to avoid
confusion, the board's printer port should always be configured for the primary assignment shown
in a primary parallel port interface is provided elsewhere in the system.