Unlocking the additional space on a fx-CG50AU

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Joined: Mon Jul 13, 2020 1:35 pm
Calculators: Casio fx-CG50, Casio Classpad fx-CP400

Unlocking the additional space on a fx-CG50AU

Postby MajesticFalcon35 » Mon Jul 13, 2020 1:44 pm

As I live in Australia, I have the fx-CG50AU. It's basically identical to the normal CG50, but it has 4MB of storage rather than 16MB, to comply with SACE regulations.
I assumed that the memory was just a smaller chip, but I connected it to my laptop the other day and looked at it through Windows Disk Management, just for kicks. Lo and behold, the additional 12MB was present, but unpartitioned.

Attempting to expand the storage through Windows caused a file system error on the calculator, which was expected. Does anyone have any ideas on how to access this 12 MB of storage for storage?

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Joined: Wed Jul 24, 2013 3:33 am
Calculators: Casio fx-7400GII (SH4), Casio fx-9750GII (SH4), Casio fx-9860GII SD, Casio Classpad 330, Casio fx-CG50, Casio Classpad fx-CP400

Re: Unlocking the additional space on a fx-CG50AU

Postby critor » Thu Jul 16, 2020 12:52 pm


First thing to do would be to open your calculator and take a picture of its Flash NAND chip.

The fx-CG10/20/50 are using a 32MiB NAND, a Spansion S99-50272 :
With a 16MiB partition reserved for the operating system (more than 12MiB big), and another 16MiB partition for storage.

The fx-CG50AU might be using a smaller 16MiB NAND, and the reported 16MiB availability would just be a software error.

By the way, any picture/capture of the file system error ? Thanks.

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