J4 for parallel or fdd – SMC Networks SpacePC 1232 Series User Manual
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J4 for PARALLEL or FDD
A parallel port is available on connector J4 of the SpacePC 1232 module. This connector is a
13x2 pin with 2.54-mm step.
Connector J4 has two operating modes:
Parallel port mode
Floppy disk interface mode
The selection between the two modes can be performed in the BIOS Setup (see Chapter 4).
Parallel
Port
J4
Figure 9.
J4 Connector Layout
The following table gives the pin-out of connector J4 for both functions (parallel port and floppy).
Table 8.
J4 Parallel/Floppy port connector
Parallel Function
Floppy Function
Pin
Signal
Function
in/out
DB25
Signal
Function
In/out
Pin
1
STB# (*)
Strobe Data
out
1
DSO# (*)
Drive Select 0 In/out
1
2
AFD# (*)
Autofeed
out
14
DENSEL# (*)
Out
2
3
PD0
LSB of printer
Data
out
2
INDEX# (*)
Index Pulse
Inp
In
3
4
ERR# (*)
Printer error
in
15
HDSEL# (*)
Head Select
Out
4
5
PD1
Printer Data 1
out
3
TRK0# (*)
Track 0
In
5
6
Initialize printer
out
16
DIR# (*)
Step Direction Out
6
7
PD2
Printer Data 2
out
4
WP# (*)
Write protect
Out
7
8
SLIN# (*)
Select printer
out
17
STEP# (*)
Step Pulse
Out
8
9
PD3
Printer Data 3
out
5
RDATA# (*)
Read Data
In
9
10 GND
Signal ground
--
18
GND
Signal ground --
10
11 PD4
Printer Data 4
out
6
DSKCHG# (*)
Disk Change
In
11
12 GND
Signal ground
--
19
GND
Signal ground --
12
13 PD5
Printer Data 5
out
7
MEDIA-ID0# (*)
In
13