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at the beginning apararece the error msg!



or comes into play

not only tried to 6264.

tepples wrote:If it's hard to reach GND or Vcc, you can still fake out the self-test by soldering the disconnected A11 and A12 pins of the chip to an adjacent address line.

I did everything you guys will send me to do but will work!

Yeah, the original was only 16Kbit, you used a 64Kbit chip. The 2 highest address lines need to be tied to Gnd or else they'll be floating, which is just asking for trouble. If they're actually connected on the PCB, you'll need to lift them from the PCB before grounding them. the pins that have to ...

bought a pcb of retrosgate.
but donkey kong 2 e 3 works not appear the error msg.
hence put the original sram and run.
but with the sram 6264 does not work, what will be what is happening?

hello here the schema for Castlevania 3.[img][img][/img][/img]