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The cartridge label claims it’s a Chinese-English dictionary.

edit: going by the somewhat tautological “英漢字典 DICTIONARY” on the top line, and the “英漢・漢英・百科字典” at the bottom, it should be an encyclopædic dictionary that can be searched for Chinese or English terms.

yeah, it's an actual dictionary, it's a 2 MB ROM, so must be banked, and there seems to be a data swap at least (since it had to be reverse engineered it's possibly just a wiring error though)

it might just be a D3/D4 line swap

I'd assumed it was a chess dictionary, but no.

Ah, I see a photo of the cart dump on Furrtek's twitter:
https://twitter.com/furrtek/status/1604596202649124865

Yup, it's possible a line got accidentally swapped here.

Schematic is the one from here?
https://twitter.com/furrtek/status/1604624707046805505
It confirms that sound is 1 bit, and the other line could be the on/off bit. Volume knob indeed comes after digitally controlled bits.

cart sort of works

dictionary

Is the melody at the beginning supposed to sound like that? It sounds like it's meant to be the traditional alphabet song (i.e. Twinkle Twinkle Little Star) but playing with the pitch inverted or something.

m_beeper->set_clock(((0xff00 ^ m_beeper_freq) + 1) * step);
instead of
m_beeper->set_clock(((0xffff ^ m_beeper_freq) + 1) * step);

does sound more like the traditional alphabet song, but still rather off.. I'm honestly not sure (it makes 'chess' and 'reversi' sound significantly worse)

Given this is a dodgy Chinese handheld, I wouldn't guarantee the original is in tune either unless someone has video of the hardware.

The unit itself seems pretty decent for the time in terms of the specs and game AI, and the Chinese translations of English terms seem OK, but the English translations for Chinese terms are rather awkward. Definitely seems to be intended for Taiwan – traditional Chinese script, not Hong Kong Cantonese.