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A Hex Editor for the Casio FX-CP400 with HollyHock-3

How To Use • Download • Credits • Community

CPHexEditor Preview

How To Use

  1. Copy the .hh3 file into the root directory of your calculator
    (do not place it inside a subfolder).

  2. Launch the calculator and open the Hex Editor through Hollyhock Launcher.

  3. Controls:

    • Cursor: ← / →
    • A, B, C, D, E, F: = / 𝒙 / 𝒚 / 𝒛 / ^ / ÷
    • Clear = quit

  4. Dumping memory:

    • Navigate to the start address (use the arrows top right).
    • Press EXP → sets start.
    • Navigate to the end address.
    • Press EXP again → sets end.
    • Press EXE → dumps memory from start to end.

    Notes:

    • Do not select very large ranges, as dumping too much memory at once can take a long time or fail.
    • During the dump process, the calculator will freeze temporarily — this is normal.
    • Once the dump is complete, a file named dump.dmp will appear in the calculator’s root directory.

  5. Searching memory:

    • Enter your search pattern in hex (e.g. >48656C6C6F for "Hello").
    • Press (-) (negative key) to start searching.
    • Results are shown directly on the screen and written to FoundAddresses.txt in the root directory.

    Range of search:

    • If you set start & end with EXP → only that range is searched.
    • If you do not set any range → the entire memory area is searched.

  6. Read/Write Control Registers

    • Click the More Options Button
    • Click on Read/Write Control Registers
    • Navigate using the ↓/↑ Buttons
    • Press EXE an type the value you want
    • Press EXE to apply the changes

  7. Change UI Theme

    • Click the More Options Button
    • Click on Change UI Theme
    • The UI does not Update instantly, you have to click a UI Button to apply the changes

Download

Download the latest release here

The release contains the .hh3 file you just need to copy onto your calculator.

Credits

Community

Join the discussion, share feedback and get help on the Snail Math Discord Server:
https://discord.com/invite/knpcNJTzpd