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

How To Use • Download • Credits • Community

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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.

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Download

👉 Download the latest release here

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

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Credits

• Original Code for HHK2 by SnailMath
• HHK3 Template by QBos07

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Community

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