As you progress in the hobby the things to realise is NOT ALL 28 way pcbs are JAMMA . These can usually be identified by the edge key cut out at pin 7 and the loom if it has no ‘idiot key’ which prevents wrong way round connection, has the thicker power wires GND & 5v paired up at pins 1//2. 3//4 which correspond to the double pass on the board at the keyed end of the connector
The BIG error some people new to the hobby don’t realise some 28 way edge connect boards are eg SEGA or CAPCOM and few other are not jamma so power and functions do not align and can damage the board… adapters to jamma are available should you ever require them and as said above - ask on this forum for advice .
Almost all Jamma compatible boards will have jamma printed on them close to the edge connector but always look closely at the edge pad layout to make sure..
A lot of other dedicated game pcbs have different number of pin edge connect or different connector all together to bear in mind if you look to buy specific games.
If you look up a game on KLOV. com it will often state conversion class as Jamma std or unique etc to guide users in some cases.
Your jamma loom also appears to only support 2 fire/jump/ bomb buttons per player? Fine for most older games and many multi game systems but STREET FIGHTER style pcbs require 6 buttons and a loom adapter can be obtained which allows 4 5 or 6 extra buttons usually attaches to a seperate pin position on the pcb
My advice is if you go on to collecting pcbs to interchange is consider a second cabinet wired to 6 buttons and jamma and perhaps a crt monitor too to save some complication ? and be happy to play the multi cab you have just for the selection you can now access .. good luck as you go!
Finally some multi game systems use simulated older games where players alternate so a single joystick and buttons only is required and while they do work fine on all double player cabs the player two controls are often redundant except for the start p2 button ….
