Hi All,
I have taken my A500 out of storage and notice the mouse does not behave correctly. It cannot move down or right reliably. Up & Left is ok.
Same behavior for my tank mouse and a PS2 mouse through adaptor.
I have checked the voltage changes at the multiplexer U15. When a Joystick is connected the 4 relevant pins drop from 5v to 0v when the stick is moved in that direction. All good.
When I connected a mouse however it is different.
Moving the mouse up and left causes the voltage to drop relivably from 5v to approx 0v.
But moving down or right only causes voltage to drop to about 2.5v.
Resistor pack RP401 is correct.
Resistance from Multiplexer pins to the actual pins in the joystick port are ok.
Is there another step I can take to check the output of the multiplexer?
Thanks, Wavey
Im not sure now whether to blame mice or multiplexer.
