Hardware Revisions

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This page has not been completed. Parts may be missing or reorganized before completed. Information is provided as-is and may have errors.

This page contains information about the four known hardware revisions used on the Prizm. The hardware goes by the internal name of LY755 (the ClassPad model fx-CP400, which shares the same CPU, goes by the internal name of LY777).

Hardware revisions are mostly the same between fx-CG 10 and fx-CG 20 models. In all the hardware revisions, the only differences between the models, and apart from any PCB inscriptions, are:

  • Two bytes in the bootloader area of the Flash. The OS checks these bytes to modify its behavior, enabling fx-CG 20 features selectively.
  • The fx-CG 20 with hardware revision 001V03 contains a different LCD controller that makes the screen white cooler when compared to a fx-CG 10 of the same revision. More information can be found on the relevant section of the Display article.

001V01

(Did this one really exist, and if yes, did it even make its way to consumers?)

001V02

001V03

Introduced in production lines in October 2010 or before.

Changes from previous version:

  • Small black component near the keyboard / battery board connector that is probably a capacitor.

001V04

Introduced in production lines in March 2013 or before.

Changes from previous version:

  • Use of Macronix Flash chip;
  • Different MPU oscillator;
  • Differences near the USB port - new test contact;
  • New test contact near the 3 pin port;
  • New LCD controller.

Calculators with this hardware revision appear to take approximately one second longer to boot.