Plugging a joystick in causes the keyboard to enter extra keys when typing

Started by Iwantgames:), 22:54, 16 March 19

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Iwantgames:)

Is it possible to fix these double key presses that I'm getting? The keyboard works perfectly fine until you plug in a joystick.

GUNHED

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TotO

(megadrive pads does that, because it is not intended to use them without adapters)
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VincentGR

This happened to me with a normal joystick, still work in progress.

Iwantgames:)

I've tried multiple joysticks.


After a lot of head scratching I finally thought to look at the AY chip. Someone has replaced it at some point with a 8912A and reading online it seems the joystick is a common issue with it. So I need to get a AY-3-8912

Bryce

Or add the resistor array that's missing in the A version. There's a footprint for it on the PCB.

Bryce.

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