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The Kempston mouse was a | [[File:Datel_genius_mouse.png|270px|thumb|Datel Genius Mouse]] | ||
The Kempston mouse was a mouse interface for the ZX spectrum and compatables. | |||
it uses an interface with two signals per direction 180 degrees out of phase to determine the direction the mouse is going in[[https://en.wikipedia.org/wiki/Incremental_encoder quadrature encoding]]. | |||
Note, The original Mice have a different pinout to either Amiga, Atari or Datel mice, so don't mix them up! | Note, The original Mice have a different pinout to either Amiga, Atari or Datel mice, so don't mix them up! | ||
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| xxxx x011 xx0x xxxx | | xxxx x011 xx0x xxxx | ||
| X axis | | X axis | ||
| 00-FF Roll over at 0 | | 00-FF Roll over at 0 and $FF | ||
|- | |- | ||
| 65503 | | 65503 | ||
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| xxxx x111 xx0x xxxx | | xxxx x111 xx0x xxxx | ||
| Y Axis | | Y Axis | ||
| 00-FF Roll over at 0 | | 00-FF Roll over at 0 and $FF | ||
|- | |- | ||
| 64223 | | 64223 |
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