Trackball

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Irrmaze bios1.png

Special controller only used in The Irritating Maze cabs.

Works the same way as an upside-down mechanical mouse. Uses two optical encoders for X and Y movement, handled by the SIT board.

A special system ROM is used (236-bios.sp1).

The counter values are read from REG_P1CNT:

Speed and direction are computed from the counter deltas.