Kempston mouse
From Grahams Wiki
The Kempston mouse is a device for the spectrum which provides a term papers mouse interface. It doesnt provide much in the way of software support however.
[edit] Circuits
http://velesoft.speccy.cz/kempstonmouse-cz.htm
[edit] Using
The mouse is read from three ports:
- FBDF 64479 Vertical
- FFDF 65503 Horizontal
- FADF 64223 Buttons.
The vertical and horizontal values wrap around at 0 and 255 Buttons are active low and are as follows:
Bit:
- 0 Right button
- 1 Left button
[edit] Mine
I have a Datel clone. It came with Art Studio, which was generally considered the best art package for the speccy. The Datel clone was built around one ASIC, and came with a Kempston joystick port as well.
Internally, its basically one ASIC, a pair of pull-up resistor networks and a few capacitors.
Here is the original mouse I got with it.
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