To write to that register, it appears that we need to put 0xff to register 0x4834, as shown in the ucon64 swc.c code.įor some unknown reason, my reader fails to write the registers most of the time.

If it has 3 as its value, the last 8Mb of the 40Mb data ROM is mapped to that range of addresses.

By default, the program ROM is mapped to addresses 0xc00000 to 0xcfffff while the first 24Mb of the data ROM is mapped to 0xd00000 to 0xffffff.

Attempts to read the other parts just give you the same first 8Mb of the data ROM.

If an unlock sequence is not written to registered addressed 0x4834, only the first 8Mb of the data ROM can be read.

In Far East of Eden Zero (Tengai Makyo Zero), the size of the data ROM is 32Mb.Ī few things that we need to know in order to read the data from the ROMs. Carts with this chip features a 8Mb program ROM and a variable-size data ROM. SPC7110 is a special chip that appears in a few SNES carts in 1995-1997. I am extending my code to support carts with SPC7110, with partial success - I can read most of the ROM data correctly, but have to be done by parts. I also follow the instruction and have my dumper done successfully.

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