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Figured out why the joystick gets "stuck" in mame!!!

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Farmboy90:

Hey guys,

In all two player games that I have played since my cab was built (Contra, Rampage, Double Dragon)... the second player joystick breaks after the second player dies.

The character just runs left and the joystick inputs don't do anything.  In other words you can't control him anymore.

Any ideas wrong is wrong?

Player 1 has no problems, things work fine all the time.  This happens only on the player 2 jostick.  The player 2 controls work absolutely fine until that person dies.



Farmboy90:

Hummm strange...  Seem my custom version of MAME was the problem.  Not sure how skip the disclaimer (the code I modified) had anything to do with that.

I'll need to debug this further I guess.

Thanks anyway guys.

The problem is back.  Even with unmodified source.  Aaaarrrggghhh!!   ???

This is frustrating.

Farmboy90:

It is strange.  I tried to play around a little bit and it is pretty incosistent.  Player two will eventually get stuck.  It seems to always happen after the player dies and comes back into the game.

No one has ever seen this problem?  Man it is really embarassing, since people are lining up to play the thing now that it is finished, and we end up having to quit games in the middle of them after player two gets hosed.

I am running mame v.102 as well.  I think I will try an older mame build later today. 

JCL:

Are you sure it is really after player 2 dies? Or does the joy stop working randomly, causing player 2 to die, but you only notice it after the fact?

Joystick
wiring
encoder



swap joystick. Does the problem follow the joytick?
swap wires. Does the problem follow the wires?
if you swap both the joystick and wires, the problem has to be with the encoder.

I would guess wiring as that is most likely to be bad. Solid core wire or stranded? Solid core breaks more easily.



Bones:

Check NC/NO wiring on joystick microswitches.

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