Kempston mouse

From Grahams Wiki

The Kempston mouse is a device for the spectrum which provides a 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.