Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Discuss hardware-related topics, such as development cartridges, CopyNES, PowerPak, EPROMs, or whatever.

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theretromarkcruz
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Joined: Wed Aug 26, 2020 2:03 pm

Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by theretromarkcruz » Sun Sep 06, 2020 10:22 am

I have made a number of games from basic, non battery saving roms on Muramasa boards with no issues whatsoever.

However, I recently started trying to create games that utilize battery saves on their advanced 4mb board, and for some reason, they never work.

For example, I have attempted to make Ganbare Goemon 2 (The English Translation), and although the game starts, I can’t get past picking a save location.

I have also tried an American released game just to see if there was an issue with the translated roms. I attempted to make Harvest Moon, and that too has not worked at all. That doesn’t even start.

I am still relatively new to making games like this, so I was curious as to where I could be going wrong? Am I using the wrong chips? Did I solder the wrong area?

Any and all help is greatly appreciated!

Thank you!

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Markfrizb
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Location: East Texas

Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by Markfrizb » Mon Sep 07, 2020 7:27 pm

It appears that your sram is actually an 8k ram and your jumpers are set for 32k. Maybe that’s the issue??

theretromarkcruz
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Joined: Wed Aug 26, 2020 2:03 pm

Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by theretromarkcruz » Tue Sep 08, 2020 9:14 am

Hmmm I actually used a 64KB ram chip. I thought that using the 2 32kb jumpers meant I had 64KB? I wasn’t quite sure how that was supposed to work to be honest.

Is too much ram a problem sometimes?

calima
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Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by calima » Tue Sep 08, 2020 10:23 am

It could fail copy protection checks, if the game has such.

lidnariq
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Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by lidnariq » Tue Sep 08, 2020 11:06 am

theretromarkcruz wrote:
Tue Sep 08, 2020 9:14 am
Hmmm I actually used a 64KB ram chip.
6264 = 64 kilobit. That's 8Kbyte.
Is too much ram a problem sometimes?
One of the pins is sometimes an address line, and sometimes a chip enable. LoROM games most often try to access their save memory at $700000 through $701FFF. In this region, the pin that is used to say "address bottom 8KB of RAM" is low, but on the 6264 that pin must be high in order to access RAM.

theretromarkcruz
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Joined: Wed Aug 26, 2020 2:03 pm

Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by theretromarkcruz » Wed Sep 09, 2020 1:54 pm

calima wrote:
Tue Sep 08, 2020 10:23 am
It could fail copy protection checks, if the game has such.
Ahh I see... That could possibly be it. If that were the case, what would I do to remove that?

theretromarkcruz
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Joined: Wed Aug 26, 2020 2:03 pm

Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by theretromarkcruz » Wed Sep 09, 2020 1:55 pm

lidnariq wrote:
Tue Sep 08, 2020 11:06 am
theretromarkcruz wrote:
Tue Sep 08, 2020 9:14 am
Hmmm I actually used a 64KB ram chip.
6264 = 64 kilobit. That's 8Kbyte.
Is too much ram a problem sometimes?
One of the pins is sometimes an address line, and sometimes a chip enable. LoROM games most often try to access their save memory at $700000 through $701FFF. In this region, the pin that is used to say "address bottom 8KB of RAM" is low, but on the 6264 that pin must be high in order to access RAM.
Oh I see that makes sense. I can try to set the jumper at 8 Kbyte to see if that helps! Thank you!

calima
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Joined: Tue Oct 06, 2015 10:16 am

Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

Post by calima » Thu Sep 10, 2020 12:56 am

Patching out copy protection is very skilled work. You might be able to find a readymade patch somewhere. Easier to fix your board (if you had used a larger SRAM, you could make it smaller by grounding the high address legs, etc).

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