Posted By
TLC on 2011-09-18 06:19:39
| Re: Joystick not working in either port
I completely agree with Lando. I too, have a couple of machines here and there, in different but more or less exactly known conditions; amongst other things, they're of great help when some problem needs to be sorted out.
I couldn't really suggest a "predictively working" solutiong for this particular case.
You can measure if the joystick adapter is good ie. it very likely works (...still not sure until it actually does, but very likely). It should be wired like this: UP/DOWN/LEFT/RIGHT/FIRE to the respective equivalent, Plus/4 Select' --> joystick GND, Plus/4 +5V --> joystick +5V. The Plus/4 GND side is unconnected. See http://zimmers.net/anonftp/pub/cbm/documents/projects/interfaces/plus4joy/figure1.gif. The Select' --> GND connection is vital, the directions are... eh... obvious, the VCC-VCC connection is optional.
If everything seems to be perfect, and it still doesn't seem to work, then the problem should be in the machine... The hard part seems to start here, as all possibly faulty components are soldered in (...and it's better to measure something twice than to desolder it (in vain) once). For that part, you'll definitely need another (known to work) machine for reference, ...unless you can, say, use an oscilloscope, so that you can see and sort possibilities out even without the help of a reference machine.
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