This port controls the LCD speed when the calculator is running at 6 MHz. The LCD usually requires 52 clock cycles of delay, but with an output of 0F7h you can eliminate all required delays.
The default value is 17h.
| Value (in hex) | Percentage of normal speed |
|---|
| 17 | 100% |
| 27 | 110% |
| 47 | 133% |
| 67 | 160% |
| 87 | 200% |
| A7 | 267% |
| C7 | 400% |
| E7 | 1300% |
| F7 | 1600% |