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Kempston Joystick

This interface is the most popular and the best way to connect joystick to ZX Spectrum. The port used is 31 (#1F) and usually only A5=0 decoding is done. The idle is 0 (#00) value in the port. The interace contains inverted 3-state buffer, as input pins are shorted to GND by the joystick, while this sets bits in port.

There are many constructions, you can see some below.


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kjschem.gif 11.7kB (2002-10-12 20:18)
Schemat. Jak zbudować Kempston Joystick z układów 74LS240 oraz 74LS32.

Zobacz również

YAMOD.KJOY
Kempston Joystick for YABUS.
Z80JOY
Wewnętrzny interfejs Kempston Joystick, montowany pod Z80 CPU (albo ponad).

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© 2009-12-28 21:50 Jarek Adamski, http://8bit.yarek.pl