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Title: Strange Graphics Mario Bros Post by: Bi11yJ0e on December 26, 2016, 07:55:16 pm Tried cleaning all connections and reseating the chips with no luck. Anyone have any ideas? Still new to this so any help would be very much appreciated!! Thanks.
(http://)http://imgur.com/a/p78Op Title: Re: Strange Graphics Mario Bros Post by: Bi11yJ0e on January 06, 2017, 03:21:27 pm Just replaced the roms and proms with parts from Mikes Arcade and still no change.
Title: Re: Strange Graphics Mario Bros Post by: shuyge on February 09, 2017, 02:39:43 pm I'm no expert, but if you're looking at the wonky graphics that are in place of the score, here's what I think. It looks like an address decoding problem to me. Either a bad buffer / driver, or a bad gate (and, nand, or, etc) or a bad address line that is causing the cpu to pick up the wrong data when it tries to fetch the font characters. Watch all of OneCircuit's youtube videos on pcb board fixes. If you can't make heads or tails of what he says, you need to send the board to someone who can fix it. Good luck. Stan |