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| 1 | not used | - | - | |
| 2 | +6V | VCC | Power supply | - |
| 3 | Ground | GND | ground | in |
| 4 | line | - | 140x(H): Port F Bit 0 | out |
| 5 | line | - | 1401/2: Port F Bit 1; PC-1403(H): address &3A00-FF | out |
| 6 | LOAD | - | Used by CLOAD, you can get this line through TEST 128 | in |
| 7 | SAVE | - | Used by CSAVE, you can set this line through port C, bits 4,5 and 6 | out |
| 8 | line | - | 1401/2: Port B - bit 7; PC-1403(H): address &3A00-FF | (in)/out |
| 9 | line | - | 1401/2: Port B - bit 6; PC-1403(H): address &3C00-&3DFF | in |
| 10 | line | - | 1403(H): use address &3A00-FF | out |
| 11 | line | - | 1403(H): use address &3A00-FF | out |
| 9 pins | 25 pins | Name | Description | Direction |
|---|---|---|---|---|
| 1 | 8 | CD | Carrier Detect - Modem has carrier and is online | in |
| 2 | 3 | RxD | Receives data | in |
| 3 | 2 | TxD | Sends data with +12V at HIGH and -12V at LOW | out |
| 4 | 20 | DTR | Data Terminal Ready - computer is ready for receiving data | out |
| 5 | 7 | GND | Ground | - |
| 6 | 6 | DSR | Data Set Ready - The other computer is ready to receive | in |
| 7 | 4 | RTS | Request To Send - This line makes the other to get ready for receiving | out |
| 8 | 5 | CTS | Clear To Send - When the other RTS sends HIGH to this line the computer starts transmitting | in |
| 9 | 22 | RI | Ring - an incoming call is detected by the modem | in |
| Bit | Pin 11 pin interface |
|---|---|
| 0 | 11 |
| 1 | 10 |
| 2 | 5 |
| 3 | 8 |
| Bit | Pin 11 pin interface |
|---|---|
| 7 | 9 |
| Bit | Pin | D=11 pin interface | I=in-,O=output |
|---|---|---|---|
| 6 | 9 | D | I(O?) not 1403(H) |
| 7 | 8 | D | IO also 1403(H) |
| Bit | Pin |
|---|---|
| 0 | 4 |
| 1 | 5 |
| 2 | 4 only at 1403(H) |