Hey guys, I was messing around with making repro carts for myself and had the crazy idea of trying to find a cheaper donor cart for making a PAL Mario RPG cart. I ordered a PAL PGA EUROPEAN TOUR without reading the specs of the cart correctly. I modded the cart and fired it up. The start music started but no sprites come up and music just plays. I started looking into the carts and found out that MARIO RPG uses a 256KB sram module and the PGA cart uses a 64KB SRAM module. Is there a drop in replacement that I could use for this? I don't want to kill off another SNES cart and would prefer to find a component on ebay or elsewhere. If so can you please tell me what the model number is that I should be looking for? Thanks! EDIT: Just found these http://www.ebay.com.au/itm/MB84256A...474?pt=LH_DefaultDomain_0&hash=item19d15e67b2 Looks like they would be the correct fit. Would these work?
In the Japanese version (which is the only one I have), the RAM chip is a Hyundai HY62256A-LLJ-10 - that Fujitsu part you linked to seems to have the same pinout. The other thing you should note is that if the board was originally designed to take a 6264 type 64kbit RAM then pin 1 will be N/C and pin 26 (CS1) will be wired to VCC - you need to lift these pins and connect them to A14 and A13 respectively.
Thanks for that. I am looking at the data sheets for both the 64k and 256K and it looks like only pin 1 and pin 27 are different. Also when you say connect to A14 for pin 1 do you mean directly to the eprom?
Pin 27 should be WE/ on both the 64 and 256 kbit parts - but this is setting off some alarm bells from the dim and distant past - Hynix once released a 6264 datasheet with the wrong pinout for the SO version of the chip - and I think that showed one of the CS lines connected to pin 27, so make sure you aren't using that one (from what I remember, it had no WE/ line at all - but did have an A13 pin. Pretty good trick for an 8K byte RAM chip). Edit - found a copy of the old bad datasheet on the net - both pinouts are shown below:
