This port controls the LCD speed when the calculator is running at 15 MHz. The LCD usually requires 142 clock cycles of delay, but with an output of 0F7h you can reduce this to about 88.
The default value is 27h.
| Value (in hex) | Percentage of normal speed |
|---|
| 27 | 100% |
| 47 | 108% |
| 87 | 120% |
| A7 | 129% |
| C7 | 140% |
| E7 | 152% |
| F7 | 158% |