sc200 jamma ?

i have an sc200 i was gonna use it for a jamma supergun but i dont think i can is there any way to switch the polarity for +5v to make it -%v prob a dumb ? but oh well

I don't think it is possible, you would need another PSU. Anyway only very few arcade games actually use -5V, with only +5V and +12V you can run MVS, cps2, atomiswave, etc.

Desktop PSUs are OK for consolizations but if you want to build a serious supergun don't use one of those, use an arcade PSU.

it is gonna be cosolized sorta sorry im not ready to say much about it till im in the building process then ill post pics and tell more info

Ahh... it's a secret! Let me guess: it's a consolized MVS that would also work as a supergun? (no you don't have to reveal it eh) but if it's something like that and you really want to use a desktop PSU, then I wouldn't use a sc200. You can find desktop PSUs that do +5/+12/-5, only they aren't as cheap...