This page formerly had a version of the conversion tool for mobileTunes 3, which converts MIDI files to a format suitable for playing back on a calculator.
The novelty of this version of the tool is that it ran entirely in your web browser and didn't rely on the server to do the actual conversion, which was enabled by php-wasm to run the original PHP code in the browser.
More recently, this version of the converter has replaced the original version on Cemetech because the server-side environment it assumed had slowly rotted over the years and it was no longer usable.