Need GameBoy MBC3

bentendo64 · **Posted:** Sun Aug 22, 2010 5:20 pm

Hi, my pokemon red version's memory bank switch bit the dust, and I would like to know of a cheap game that I can get that has MBC3 in it. I'm going to be making a memory coppier that uses the memory bank swith MBC3, but with mine broken, it's kind a hard to read/ write the memories.

that sounded really stupid, so I laugh at myself, before you can laugh at me :lol:

, but I am serious.

Snow_Cat · **Posted:** Fri Sep 10, 2010 10:48 pm

I think Triton was thinking about doing a DIY Gameboy Flash Cart from Scrap Parts.

A quick google search shows that the MBC5 is essentially software compatible with the MBC3, except for the lack of a clock function.

ziegler.desaign.deGameBoy Cartridge Reader and Writer by Reiner Ziegler seems to have a lot of inormation about modifying cartridges.

Mostly it seems to be a problem of finding an eeprom and wiring it to the address, data and control lines.

nitro2k01 · **Joined:** Tue Dec 19, 2006 12:41 pm **Posts:** 641

More details, please. How do you it bit the dust? How does it behave?
What is it that you want to do? Save your save data? Build a flash cartridge?

bentendo64 · **Posted:** Wed Sep 15, 2010 8:10 pm

It will use the Mega Memory card for Gameboy, made by Inter-Act. It will be able to copy memory chips (flash, eeprom, fram, etc....). You put the memory card in the gameboy, then connect the seperate board, that I made, with the MBC, a copy of a Nintendo Gameboy rom, and a breadboard. You place the memory chip into the breadboard, connect the a/d and control busses to the appropriate pins on the memory chip. Turn the Gameboy on. select "backup" on the menu. To copy to another chip, put the blank one in the breadboard, connect the wires, turn the Gameboy on, select restore, and select the file you would like to copy.

Where the MBC comes in is so I can copy up to 256k bits at a time, instead of 64k bits.

nitro2k01 · **Joined:** Tue Dec 19, 2006 12:41 pm **Posts:** 641

Still not sure I get your idea. Do you want to build a flash cartridge and use the MMC to write to the flash chip via the SRAM?

Snow_Cat · **Posted:** Thu Sep 16, 2010 5:30 pm

Isn't the Mega Memory cartridge was a gameboy savestate ('snapshot') copier without the ability to store games?

Now; if you are making a cartridge to hold GB/GBP/GBC games then you can use the MBC5 chip since it essentially software compatible with MBC3.
According to http://www.ziegler.desaign.de/cgbmbc5.pdf MBC5 is compatible with MBC1-5.

And here's my own analysis:

Spoiler:

information taken from:

http://www.devrs.com/gb/files/gbspec.txt

http://www.devrs.com/gb/hardware.php#hardgb

http://fms.komkon.org/GameBoy/Tech/Carts.html

http://www.virtualgbx.com/help/doc/gametypes.html

http://pinouts.ru/Game/CartridgeGameBoy_pinout.shtml

http://www.otakunozoku.com/2003/02/26/n ... cribsheet/

http://meatfighter.com/gameboy/GBCPUman.pdf

http://meatfighter.com/gameboy/TheNintendoGameboy.pdf

All sizes in bits, writes to ROM space is intercepted by the MBC.
common Multi-Bank Controllers:

The upper bit of the RAM address bus is linked to the motor controller, lame waste of 1/2 the address space.

Without exception MMCs 1 through 5 each contain a super set of the features of the lower levels. The specific features like SRAM, RTC and rumble have each been mapped to memory with varyign degrees of efficiency. Therfore it is preferable to substitute use the far more common MMC5 for an MMC3 chip - though that may lead to minor corruption if the user decides to set the RTC, as that would be redirected to RAM.

edit:grammar

Need GameBoy MBC3

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