Chapter 3 |
| Hardware | |
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| Pin # | Signal | Description |
| 8 | SLIN | Select In – This output signal is used to select the printer. I/O pin in ECP/EPP |
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| STEP | mode. |
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| Step – Low step pulse for each | |
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| 9 | PD3 | Parallel Port Data 3 – This pin (0 to 7) provides parallel port data signals. |
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| RDATA | Read Data – Raw serial bit stream from the drive for read operations. |
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| 10 | GND | Digital Ground |
| 11 | PD4 | Parallel Port Data 4 – This pin (0 to 7) provides parallel port data signals. |
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| DskChg | Disk Change – Senses the drive door is open or the diskette has been changed |
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| since the last drive selection. | |
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| 12 | GND | Digital Ground |
| 13 | PD5 | Parallel Port Data 5 – This pin (0 to 7) provides parallel port data signals. |
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| 14 | GND | Digital Ground |
| 15 | PD6 | Parallel Port Data 6 – This pin (0 to 7) provides parallel port data signals. |
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| 16 | GND | Digital Ground |
| 17 | PD7 | Parallel Port Data 7 – This pin (0 to 7) provides parallel port data signals. |
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| 18 | GND | Digital Ground |
| 19 | Ack* | Acknowledge* – This is a status output signal from the printer. A Low State |
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| DS1 | indicates it has received the data and is ready to accept new data. |
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| Drive Select 1 – Selects floppy drive 1. | |
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| 20 | GND | Digital Ground |
| 21 | Busy* | Busy* – This is a Status output signal from the printer. A High State indicates |
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| MTR1 | the printer is not ready to accept data. |
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| Motor Control 1 – Selects or enables the motor on floppy drive 1. | |
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| 22 | GND | Digital Ground |
| 23 | PE | Paper End – This is a status output signal from the printer. A High State |
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| WDATA | indicates it is out of paper. |
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| Write Data – Encoded data to the drive for write operations. | |
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| 24 | GND | Digital Ground |
| 25 | Slct | Select – This is a status output signal from the printer. A High State indicates |
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| WGATE | it is selected and powered on. |
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| Write Gate – Signal to the drive to enable current flow in the write head. | |
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| 26 | Key/NC | Key Pin/Not Connected |
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Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.
32 | Reference Manual | CoreModule 420 |
