Hori Track

Hori produced a trackball compatible with Moero Pro Soccer, Moero Pro Soccer, Putt Putt Golf, and US Championship V'Ball. It was released in Japan, and what appears to be a prototype U.S. version was exhibited behind glass in Nintendo World, but the U.S. version never reached stores.

Report byte 1 is the embedded standard controller.

Byte 2, MSB first:

7654 3210
|||| ++++- Axis 2, signed 4 bit, XOR with $F
++++------ Axis 1, signed 4 bit, XOR with $F

Byte 3, MSB first:

7654 3210
|||| ++++- Unknown (read and unused by games)
||++------ ID bits (1 or 2 depending on version)
|+-------- Unknown (speculated by nocash to be the speed switch)
+--------- Rotation mode switch (0: R, 1: L)

In rotation mode L, Up on the Control Pad points up, axis 1 points down, and axis 2 points right. In rotation mode R, Up on the Control Pad points right, axis 1 points left, and axis 2 points down.

The ID bits are in the same place as those of the Four Score hub, which is also based on a Hori design. It is speculated that axis 2 can be used to distinguish them.