| Pin | I/O | Symbol | Function | President George |
|---|---|---|---|---|
| 1 | NUMO | Non-user pin. Do not connect it to any lines | Not connected | |
| 2 | NUMG | Non-user pin. Connect it to GND | Not connected | |
| 3 | AVcc | Power pin for A/D converter | + 5 Volt | |
| 4 | I | AN0 | Analog input pin for A/D converter | Not connected |
| 5 | I | AN1 | Analog input pin for A/D converter | Meter level input (RF/SWR/S/MOD) |
| 6 | I | AN2 | Analog input pin for A/D converter | Channel UP/DOWN from Mic. |
| 7 | I | AN3 | Analog input pin for A/D converter | Not connected |
| 8 | I | AVss | Ground pin for A/D converter | 0 Volt |
| 9 | I | TEST | Used for factory testing only. Connect this pin to Vcc | |
| 10 | I | OSC 1 | Input pin for the internal oscillator circuit | |
| 11 | O | OSC 2 | Output pin for the internal oscillator circuit | |
| 12 | I | RESET | Reset the MCU | |
| 13 | I | X1 | Used for a 32.768 kHz crystal for clock purposes | Not connected |
| 14 | O | X2 | Used for a 32.768 kHz crystal for clock purposes | Not connected |
| 15 | GND | Connected to ground | 0 Volt | |
| 16 | I/O | D0 | Input/output pin adressed by individual bits. | TX/RX switch in |
| 17 | I/O | D1 | Input/output pin adressed by individual bits. | Not connected |
| Keyboard strobe input | ||||
| 23 | I/O | D7 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 24 | I/O | D8 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 25 | I/O | D9 | Input/output pin adressed by individual bits. | Keyboard strobe input |
| 26 | I | D10 | Input pin adressed by individual bits. | Mode SW: 1=Defalt 0=CEPT |
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