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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
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