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Author Topic: -5volts Jamma harness?  (Read 1735 times)

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darkairplane

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-5volts Jamma harness?
« on: March 16, 2018, 01:11:53 pm »
Hello forum, I have a street fighter 2 pcb that I would like to play but I only have a Mortal Kombat 2 cabinet at the moment.  The Jamma harness for the mk2 uses -5v.  Would it be safe to use the same harness to play street fighter 2 since street fighter 2 does not use -5v? ??? Thank you.
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DeLuSioNal29

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Re: -5volts Jamma harness?
« Reply #1 on: March 16, 2018, 01:55:52 pm »
Perfectly safe.  Although you still need a kick harness that goes from the PCB to the controls for the kick buttons.  Hence it's name.

http://pdf.textfiles.com/manuals/ARCADE/S-Z/Street%20Fighter%20II%20-%20Champion%20Edition%20%5BInstruction%5D%20%5BEnglish%5D.pdf

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pbj

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Re: -5volts Jamma harness?
« Reply #2 on: March 16, 2018, 02:08:15 pm »
The -5V pins on that Street Fighter board don't go anywhere.

 
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darkairplane

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Re: -5volts Jamma harness?
« Reply #3 on: March 16, 2018, 03:08:14 pm »
Ok!  Thank you so much.  I’ll try it out this weekend!
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darkairplane

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Re: -5volts Jamma harness?
« Reply #4 on: March 18, 2018, 12:40:08 pm »
Are there any pcbs that can be harmed by -5v?  I have a cps2 marvel vs capcom, and a 1 slot neo geo mvs model MV1 I think.  I guess the question would be can I use this harness on all jamma standard PCBs without harm?  Thank you.
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AndyWarne

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Re: -5volts Jamma harness?
« Reply #5 on: March 18, 2018, 01:11:44 pm »
Quote from: darkairplane on March 18, 2018, 12:40:08 pm
Are there any pcbs that can be harmed by -5v?  I have a cps2 marvel vs capcom, and a 1 slot neo geo mvs model MV1 I think.  I guess the question would be can I use this harness on all jamma standard PCBs without harm?  Thank you.

Yes, no problem. Some early boards used -5V for "Three rail RAM" chips such as TMS4060 which needed +5, +12 and -5. Later boards the pin is not wired to anything on the board.
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darkairplane

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Re: -5volts Jamma harness?
« Reply #6 on: March 19, 2018, 04:02:09 pm »
Thank you for all your help guys.  Boards work fine.
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