Calibrating the ClockGen
To calibrate the Clock Generator you first need to enable it in config.h by removing // in front of the following two options:
/****/
/* [ SNES Core/CLOCKGEN: Read Clock Generator Calibration Data ---- ]
Toggle clock calibration menu and whether or not to use calibration data from snes_clk.txt
*/
#define OPTION_CLOCKGEN_CALIBRATION
#define OPTION_CLOCKGEN_USE_CALIBRATION
Then you find a new menu entry under "Super Nintendo/SFC" called "Calibrate Clock". Once the calibration function was loaded place one end of a jumper wire against SNES slot pin 43(A18/BA2) and the other end of the wire against one of the following pins and it should read those values:
- 3072000.00 Hz when connected to SNES slot pin 56(CIC Clock)
- 4000000.00 Hz when connected to SNES slot pin 1(EXT Clock)
- 1000000.00 Hz when connected to SNES slot pin 57(CPU Clock)
Once you have adjusted the clock to match the values more closely hold the button for a very long time and let it go to save the setting.
Video:
