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
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).
J4
Parallel
Port
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
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| Parallel Function |
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| ||
Pin | Signal | Function | in/out | DB25 | ||
1 | STB# (*) | Strobe Data | out | 1 | ||
2 | AFD# (*) | Autofeed |
| out | 14 | |
3 | PD0 | LSB | of | printer | out | 2 |
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| Data |
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4 | ERR# (*) | Printer error | in | 15 | ||
5 | PD1 | Printer Data 1 | out | 3 | ||
6 |
| Initialize printer | out | 16 | ||
7 | PD2 | Printer Data 2 | out | 4 | ||
8 | SLIN# (*) | Select printer | out | 17 | ||
9 | PD3 | Printer Data 3 | out | 5 | ||
10 | GND | Signal ground | 18 | |||
11 | PD4 | Printer Data 4 | out | 6 | ||
12 | GND | Signal ground | 19 | |||
13 | PD5 | Printer Data 5 | out | 7 |
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| Floppy Function |
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| Signal |
| Function | In/out | Pin | ||||
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| DSO# (*) |
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| Drive Select 0 |
| In/out | 1 |
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| DENSEL# (*) |
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| Out | 2 |
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| INDEX# (*) |
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| Index Pulse |
| In | 3 |
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| Inp |
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| HDSEL# (*) |
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| Head Select |
| Out | 4 |
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| TRK0# (*) |
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| Track 0 |
| In | 5 |
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| DIR# (*) |
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| Step Direction |
| Out | 6 |
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| WP# (*) |
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| Write protect |
| Out | 7 |
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| STEP# (*) |
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| Step Pulse |
| Out | 8 |
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| RDATA# (*) |
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| Read Data |
| In | 9 |
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| GND |
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| Signal ground |
| 10 |
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| DSKCHG# (*) |
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| Disk Change |
| In |
| 11 |
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| GND |
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| Signal ground |
| 12 |
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| In | 13 |
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