PC 并行介面外觀是 25 針母插座：
引腳定義
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | /STROBE |
| Strobe |
| 2 | D0 |
| Data Bit 0 |
| 3 | D1 |
| Data Bit 1 |
| 4 | D2 |
| Data Bit 2 |
| 5 | D3 |
| Data Bit 3 |
| 6 | D4 |
| Data Bit 4 |
| 7 | D5 |
| Data Bit 5 |
| 8 | D6 |
| Data Bit 6 |
| 9 | D7 |
| Data Bit 7 |
| 10 | /ACK |
| Acknowledge |
| 11 | BUSY |
| Busy |
| 12 | PE |
| Paper End |
| 13 | SEL |
| Select |
| 14 | /AUTOFD |
| Autofeed |
| 15 | /ERROR |
| Error |
| 16 | /INIT |
| Initialize |
| 17 | /SELIN |
| Select In |
| 18 | GND |
| Signal Ground |
| 19 | GND |
| Signal Ground |
| 20 | GND |
| Signal Ground |
| 21 | GND |
| Signal Ground |
| 22 | GND |
| Signal Ground |
| 23 | GND |
| Signal Ground |
| 24 | GND |
| Signal Ground |
| 25 | GND |
| Signal Ground |
ECP 并行口定義
ECP 是 Extended Capabilities Port 的縮寫，外觀同并行口，是 25 針母插座：
引腳定義
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | nStrobe |
| Strobe |
| 2 | data0 |
| Address, Data or RLE Data Bit 0 |
| 3 | data1 |
| Address, Data or RLE Data Bit 1 |
| 4 | data2 |
| Address, Data or RLE Data Bit 2 |
| 5 | data3 |
| Address, Data or RLE Data Bit 3 |
| 6 | data4 |
| Address, Data or RLE Data Bit 4 |
| 7 | data5 |
| Address, Data or RLE Data Bit 5 |
| 8 | data6 |
| Address, Data or RLE Data Bit 6 |
| 9 | data7 |
| Address, Data or RLE Data Bit 7 |
| 10 | /nAck |
| Acknowledge |
| 11 | Busy |
| Busy |
| 12 | PError |
| Paper End |
| 13 | Select |
| Select |
| 14 | /nAutoFd |
| Autofeed |
| 15 | /nFault |
| Error |
| 16 | /nInit |
| Initialize |
| 17 | /nSelectIn |
| Select In |
| 18 | GND |
| Signal Ground |
| 19 | GND |
| Signal Ground |
| 20 | GND |
| Signal Ground |
| 21 | GND |
| Signal Ground |
| 22 | GND |
| Signal Ground |
| 23 | GND |
| Signal Ground |
| 24 | GND |
| Signal Ground |
| 25 | GND |
| Signal Ground |
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