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H/V Count Timer
From SnesLab
The H/V Count Timer can be programmed to generate an IRQ when the CRT's raster beam reaches a particular position.
The desired horizontal position should be written to HTIMEL and HTIMEH.
The desired vertical position should be written to VTIMEL and VTIMEH.
See Also
Reference
- page 2-16-1 of the official Super Nintendo development manual