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Xiaou2:

--- Quote ---Good thing to bring up!

It's easy to miss that with the older games when you're in the habit of seeing a service button to map.
--- End quote ---


 Thanks.  :)

 But do remember... that its not just older games.  Pretty much all arcade games from old to newly released games... usually have a calibration system in the service menu.

 Pots can get out of alignment when they are serviced, because of the gearing.  The op has to know where to position it, so that it has the correct range of values... and so that it does not travel past its full turning capability.  The game itself may have a preferred range that you need to physically adjust for... and or the Calibration will allow the game to re-map the games settings to match your pots min and max values.

 The calibration is also used for making sure there are no bad spots.  Though, its doubtful that any games skip values based on a bad spot. It just allows an op to know its time to replace that pot, when they see the values cease to change. 

 Pots are pretty durable, and can last many years of abuse without issue... but eventually, wear can break them down, and you end up with a 'bad-spot', intermittent connection / complete failure.

 Pots come in two main types:  Linear and Logarithmic (aka "audio taper").  You can probably still grab them at Radio Shack for pretty cheap.  Linear is what you want.  Linear ups/downs the resistance gradually  (1,2,3,4,5...)   ...where as Audio Taper pots tend to increase or decrease values in a multiplicative scale  IE: 1,2,3,10,25,100


 Another note about Spy Hunter... is that if the gas pot isnt well calibrated.. you can either go too fast (faster than the game intended a player to go), or, not have the ability to Boost.  Turns out that the game has a Turbo boost of speed that comes from high gear and a deep push of the pedal.  You can see flames shoot out the rear the car when it happens.

 AfterBurner II has a similar thing.. where you get a limited speed burst when you drop it into high speed.  The after-burners engage, and you rocket past things like mad for a few seconds, until it wears off and goes back to normal.


 Its a little odd that the Spyhunter designers didnt hard-limit the acceleration.  Eventually people found out that if you dislodged the pedal, you could make it go down further... and get more speed out of the car.  I believe this gives you enough speed in low gear to outrun baddies... where as normally, you could never do that... and have to risk high speed impacts in high gear to burst away.

 I suspect that many people who play SH using mame do not know about the gas clipping, and get an unfair and unrealistic response out of the game as a result.  Unless you have the exacting pot travel of the original... and or limit your pedal physically... then I think you will not have the correct gameplay speeds.  Calibration values between a real machine and mame computer gas pedals might help to figure out the proper setting.. but you still will have to physically solve this... unless someone creates a software cheat to lock-down the gas pedal values.

Gray_Area:
Did someone edit my last post?  Anyways. It's the yoke. I'm not tearing it apart any time soon, though.

Xiaou2:

--- Quote ---I'm not tearing it apart any time soon, though.
--- End quote ---

 Tearing apart?   The x axis pot isnt even covered up.  Its on the outside of the yoke.

Takes one set screw, One small nut, and 3 solder joints to remove the pot.

 If your a rookie with a soldering Iron & are really taking your time, maybe it would take you 30min tops.   I could probably do it in less than 15 min (start to finish, including getting the tools together), less than 10 if I was playing against the clock... for the fun of it.

 Try taking apart a Race Drivin sit down shifter, and replacing those pots.  Now thats a bit of a challenge.

RCA KeGGeR:
http://forums.arcade-museum.com/showthread.php?t=238995    Yoke for Sale

leapinlew:

--- Quote from: Xiaou2 on June 03, 2012, 11:50:21 pm --- As for the return to center shifters... they stink. 
 
--- End quote ---

Spyhunter is a great game. It's like Pole Position in the fact that you can't beat it and the best you can do is improve your score and get further.

I built a mame machine with a return to center shifter. I agree that the shifter isn't ideal, in fact it downright stinks in some games, but I think for Spy Hunter where there is only a Lo/Hi and it's pretty obvious which one you are in, it would be the best substitute.

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