Syscall index: 0x12D8
Function signature: void SetBacklightDuration(char durationInHalfMinutes)
Sets the amount of time after which the backlight dims if no key is pressed.
- durationInHalfMinutes - amount of half minutes (30 second units) the calculator should wait after the last key press, before automatically reducing the brightness to the lowest level one can set on the System menu. Minimum value is 1 (30 seconds), no maximum is known other than the limits of char.