| Pins | CrystalFontz | MINI-MAX/51-C2 Expansion Port | Pins | Description |
| 1 | Vss | Ground | 3 | 5V Supply Return |
| 2 | Vdd | Vcc | 2 | 5V Supply |
| 3 | Vo | External | NC | |
| 4 | E | P3.2 | 18 | Enable |
| 5 | R/W | P3.3 | 17 | Read/Write Select |
| 6 | A0 | P1.7 | 5 | Command/Data |
| 7 | DB0 | P1.0 | 12 | Data Bus 0 |
| 8 | DB1 | P1.1 | 11 | Data Bus 1 |
| 9 | DB2 | P1.2 | 10 | Data Bus 2 |
| 10 | DB3 | P1.3 | 9 | Data Bus 3 |
| 11 | DB4 | P3.4 | 16 | Data Bus 4 |
| 12 | DB5 | P3.5 | 15 | Data Bus 5 |
| 13 | DB6 | P3.6 | 14 | Data Bus 6 |
| 14 | DB7 | P3.7 | 13 | Data Bus 7 |
| 15 | CS | P1.6 | 6 | Chip Select |
| 16 | RES | P1.4 | 8 | Reset |
| 17 | Vee | NC | NC | Contrast Adjust |
| 18 | FGND | Ground | Ground (same as pin 3) | Frame Ground |
| 19 | NC | NC | NC | |
| 20 | NC | NC | NC |