Snow bros genesis repro not working, need help.

itopeteitopete
in The Brewery
I downloaded the Japan Snow Bros ROM and tested witH AN EMU, worked fine.
I'm using a 27c160 eprom
ByteSwaped before burning
Using a Sonic 2 PCB

Did I miss something?

Thanks for your help!!

Comments

  • JazzmarazzJazzmarazz
    Both games are 1Mbyte, your EPROM is also 1Mbyte so we can exclude hanging pins and disconnected address bits as problems.

    Where have you tied pin 32? Follow the trace and tell us where it leads.
  • itopeteitopete
    Pin 32 and 42 are both to 5V this is a 2Mbyte EPROM, is possible that because of this addresses always point to an empty area?? I didnt do the mirroring btw... Read someplace that was not neccesary for genesis repros :-( but I think that might solve it, what do you think? I'm going to connect pin 42 to GND and see what happens :-D
  • itopeteitopete
    It worked by connecting Pin 42 to GND :-) Thanks ;-)
  • JazzmarazzJazzmarazz
    Sorry, I simply assumed you had no floating address pins. While floating, these pins may oscillate from high to low very rapidly, switching banks and sending data that the console is clearly not wanting to read!
  • itopeteitopete
    I had no floating pins, it was connected by default to Vcc, I cut the track and solder a cable to GND... Thanks ;-)
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