Mouse for ZX Spectrum

Kempston Mouse

Mouse interface with two 8bit reverse counters. Readed in ports: #FADF (button bits: 0 - right, 1 - left, 2 - middle), #FBDF - X, #FFDF - Y. Usually incomplete decoding: A0, A5, A7, A8, A10, /RD, /IORQ, sometimes A9. There is port conflict with Kempston Joystick in Timex Computer 2048, that decodes only A5.

This is the recommended solution, however complicated at hardware level. In some constructions Amiga mouse can be used or PS/2 mouse with PIC converter.

AMX Mouse

Mouse connected with Z80PIO chip. Generates IM 2 vectors in moment of movement.

GEOS Mouse

Special Commodore mouse works like joystick.

Amiga mouse in Kempston Joystick port

Needs special driver. The mouse status must be readed over 500 times a second to not lose movement information.

Serial mouse

PC mouse connected with serial interface (e.g. YAMOD.8250) that generates interrupts. Works at 1200bps, what gives up 40 status informations per second.

The simplest solution is to use 8251 chip set 1200bps and MAX232 as voltage converter. (Some mice take LED power from -12V line.)

Files for download

kempston_mouse_turbo-3c-test.pdf 638.7kB (2005-09-18 20:49)

[cz] Description and test (source codes) of Kempston Mouse, interface made with PIC and CPLD, that supports Amiga, PC and USB mice.

kmouse.gif 20.0kB (2005-04-11 16:19)

Schematics of Kempston Mouse made from 4516, 74244, 74138 and 74125 chips.

kmouse.html 15.1kB (1999-11-20 19:49)

[en] Kempston Mouse description with ASCII schematics and assembler driver.

Links to other pages

http://velesoft.speccy.cz/othermouse-cz.htm

[cz] Description of mouse interfaces.