Websites like FooPlot or Web2.0calc do not work. You need a simulator built for Chinese or Taiwanese exam calculators (e.g., the Canon F-502G or similar Sharp EL series). While not identical, they handle 95% of the same functions:
However, owning a physical unit isn't always convenient. Whether you're a student who forgot their calculator before an online exam, a teacher wanting to demonstrate functions on a big screen, or a developer testing keystroke sequences, the question inevitably arises: canon f-789sga ii emulator