Is there something wrong with my jamma harness!

[Darren01274]

acording to the pinout document pin Z a are for 2p button one 2p button two althought nothing is connected to a.

according to pinout also it says v 18 when you look at the connector its 18 R ?

[BobA]

First of all there are 2 sides to a jamma harness one is numbered 1 to 28 and connects to the component side of the PCB.  The other side is A to Z and aa to ff or a to f to give the same 28 choices and connects to the solder side of the PCB.  Pin Z is Player 2 button 1.  V should always be across from 18.  Check your harness and see how it compares to the JAMMA standard.


  Bob Roberts How to wire your harness
  Jamma Harness Numbering at Bottom of Page

[rchadd]

with jamma note some letters are missing (for example no G or I) think its to avoid confusions

[BobA]

+ 1 for Rchadd

Thanks for mentioning the missing letters.  I supplied the table instead.