sram 6264 does not work!!!

[gilsonpa]

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?

[Memblers]

It's possible that the game is checking the size of the SRAM, and not working if the size is different than expected. I don't know about these specific games, but that type of check was sometimes used to prevent people from playing the game on the cart copier systems that were available at the time.

If one is 6264, what is the part number other SRAM? Different size SRAMs tend to have different chip enable pins.

[qwertymodo]

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.

[Markfrizb]

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.

Yes, I can confirm this. DKC1/2/3 can only use 16k SRAM otherwise, a protection mode kicks in. Do what quertymoto said.

[gilsonpa]

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 have to call the A11 and A12 are GND?

[qwertymodo]

Disconnect pins A11 and A12 from the PCB, then connect the pins to Gnd. You need to disconnect them first because the fact that the DRM is kicking in means that they are actually connected to the cart's address lines and you don't want to connect those to Gnd, just the pins on the chip.

[tepples]

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.

[gilsonpa]

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!

[getafixx]

Where does the game crash?

Does it not load at all?

You said with the original SRAM it works fine. Have you tried any other 6264 SRAMs? Maybe you've just got a bad chip.

[gilsonpa]

at the beginning apararece the error msg!



or comes into play

not only tried to 6264.