LCD Screenshots

Hold btn:[SHIFT] and press btn:[DISP] to get a screenshot.

You will find a .bmp file named according to the current time and date in the /SCREENS folder of the FAT drive.

RTC correction

Note that to apply RTC correction you have to know (measure and calculate) ppm drift of calculator clock first.

Use following steps to apply clock frequency correction.

  1. Calculate correction factor C which best matches required ppm correction P

    C = 2^20 P /(10^6 + P)

    resulting value C has to be integer and -511 <= C <= 512.

  2. Create file /rtccalib.cfg in root directory of calculator FAT disk and write value C there.

  3. Once the RTC correction is active the ppm value is written in Setting menu at the end of "Set Time >" line.

It is possible to use approximate expressions between correction factor C and ppm value P (with reasonable precision):

C = 1.04858 P

P = 0.953674 C