Specifications
Table 2-11. Parallel Printer Connector (J6)
J6
SIGNAL
NAME
FUNCTION
IN/ruT
DB25
PIN
CONN.
PIN
1
-DS
Sample
input data out
1
3
Data 0
LSB
of
printer
data out 2
5 Data 1
: out
3
7 Data 2
:
out
4
9 Data 3
:
out
5
11
Data 4 : out
6
13
Data 5
:
out
7
15
Data 6
:
out
8
17
Data 7
MSB
of
printer
data
out
9
19
-ACK
Character accepted
in
10
21
BUSY
Cannot
receive data
in
11
23
PAPER
END
Out
of paper
in
12
25
SELECT
Ready
to
receive data in
13
2
AUTOFD
Autofeed out
14
4
-ERROR
Printer
error
in
15
6
-INIT
Initialize
printer
out
16
8
SELECT
Select
printer
out
17
10,12,
14,16,
18,20,
22,24
GND
Signal ground
---
18-25
Printer Port Jumpering
Three jumper options
--
Wll,
W
46,
and W
47
--
pertain to the functions associated with the
board's
parallel printer port. The various options are shown in
Table
2-12.
Table 2-12. Parallel Printer Configuration
JUMPER
SIGNAL
FUNCTION
W11
To
ASIC1
Selects
1/0
address.
open:
378-37Fh
short:
3BC-3BFh
default:
open (378-37Fh)
W46
IRQ7
Connects the on-board
printer
port
to
IRQ
7
Default:
shorted
(trace)
1447-1
V40
SRDY
V40
Serial
Port handshake
1447-2
Handshake
Out
option.
1447-3
-INIT
Default:
1/2
Jumper option
Wll
allows a choice of two
I/O
port addresses for the printer port: 378-37Fh,
or 3BC-3BFh. Normally, the
DOS LPT1 device has address 378-37Fh; however,
the
ROM-
BIOS
scans
both
choices and will install the flrst one it flnds as LPT1 regardless
of
which
option has
been
conflgured.
The
printer port should normally
be
conflgured for 378-37Fh
(Wll
unshorted), unless another parallel port interface
is
present
on
the
PC
bus.
2-13