I got an MVS NeoGeo board and two carts recently, wired up RGB and the three voltages (12v, 3v and 5v) however used a 7805 to step down for the 5v, and it clearly can't deliver. a 7805 can muster up to 1.5 amps, wasn't enough. I got lots of small coloured squared on the screen with some ASCII characters moving a bit. I presume the board is ok (hopes), just needs lots more amperage. Would a TI card suffice (5v at 2.25amps max)?
So, what amps do the three volt lines need please to work on the MVS please?
Is the issue mentioned above with the coloured blocks down to insufficient amps?