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Main => Main Forum => Topic started by: PedroSilva on October 16, 2003, 07:49:08 am

Title: Question about I-pac
Post by: PedroSilva on October 16, 2003, 07:49:08 am

Hi Guys,

Need a little help here ... :)

I've seen in ultimarc's site that we can emulate emulation keys with the combination of two keys ... for instance,  if we press "Player 1 Start" and "Player 1 Down" we have the key for "PAUSE GAME".

Question: If we connect one button to both keys in I-pac, do we have the same result when we press that button ?

Thanks,

Title: Re:Question about I-pac
Post by: Tiger-Heli on October 16, 2003, 09:33:41 am

Quote from: PedroSilva on October 16, 2003, 07:49:08 am

Hi Guys,

Need a little help here ... :)

I've seen in ultimarc's site that we can emulate emulation keys with the combination of two keys ... for instance,  if we press "Player 1 Start" and "Player 1 Down" we have the key for "PAUSE GAME".

Question: If we connect one button to both keys in I-pac, do we have the same result when we press that button ?

Thanks,

Short answer - No!

Long answer - You would want to use diodes if you did this.  Otherwise, whenever you pressed P1 Start, you would also press P1 Down (through the button contacts) and Pressing P1 Down alone would also Press P1 Start (and normally maybe Pause the game).

Even using diodes, this won't work with the I-PAC because of the way the Shift Key operates.  Basically, pressing P1 Start and THEN pressing P1 Down activates the shift function in the I-PAC.  Pressing them together does not (probably activates one or the other, but not both.)

I think you could do this without using the I-PAC's shift function, by say wiring a switch up with diodes to P2 Start and P1 Down, and then setting MAME up so that Pause = "2 and DownArrow".  Or reprogramming the I-PAC so P1 Start was not the shift key and doing the same as above with P1 Start and P1 Down.

You can also do what you are suggesting with the KeyWiz (www.groovygamegear.com) using Stealth-shifted buttons - see http://www.fraggersxtreme.com/arcadepanels/encoder/shiftkeys.htm for a discussion of stealth-shifted inputs and http://www.fraggersxtreme.com/arcadepanels/encoder/pausekey.htm for a discussion of wiring one button to two encoder inputs.

Title: Re:Question about I-pac
Post by: PedroSilva on October 16, 2003, 10:01:42 am

Hi Tiger,

Thanks for your help.

Title: Re:Question about I-pac
Post by: grafixmonkey on October 16, 2003, 10:44:57 pm

You would want to just assign one of the buttons on the Ipac to the 'P' key.  Then when you press that button it pauses the game.  (I've got a pause button on my panel.)

BTW, if you're putting a pause button on your panel, you can have a switch hidden somewhere that turns on and off the connection to it.  That way if you have street fighter tournaments or something, your opponent can't pause the game.   ;)

Title: Re:Question about I-pac
Post by: eightbit on October 17, 2003, 09:10:41 am

Another option that often gets missed when people get caught up in doing it all in hardware is that with mame you can specify any key combination as a input. Like you can pick 3 buttons and say when they are pressed together its pause. Your not limited to what the interface can do.

Title: Re:Question about I-pac
Post by: Tiger-Heli on October 17, 2003, 09:53:31 am

Quote from: eightbit on October 17, 2003, 09:10:41 am

Another option that often gets missed when people get caught up in doing it all in hardware is that with mame you can specify any key combination as a input. Like you can pick 3 buttons and say when they are pressed together its pause. Your not limited to what the interface can do.

I mentioned that in my initial reply, but the OP wanted a one button solution, which would require diodes (and NOT using the I-PAC's shift function).