Tama-Go Mask ROM

As a next step in trying to dump the Tamagotchi code, I’m trying to dump the mask ROM that comes in Tama-Go figures. After an hour or so of messing around with a signal analyser, I decided to take a look at the board.

On the right is an unpopulated board for that Tamagotchi figure, the blue areas are what was visible before I scraped the covering off the traces. Based on the position of the pads and the size of the rectangle for the die, I think it’s a GeneralPlus GPR26LXXX Low Voltage SPI ROM, either the 8MB or the 16MB version.

This means that the Tamagotchi figure pins are then as follows:

1, 4 and 8: Ground/Jumper Power/Jumper (Edited 2013/02/09)

2: Serial clock (C)

3: Serial data input (D)

5: Power Ground (Edited 2013/02/09)

6: Chip Select (SB)

7: Serial Data Output (Q)

I tried to confirm this by removing the PCB from the back of the die and taking a peek at the pads (yes, I realize now that they’re on the top).

It turns out that this is not a recommended technique.

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