3:27 Hearing the cassette drive noise is in sync with the screen scrolling. Seems it's reading the graphic data directly from the cassette drive instead of using program code to generate the graphic?
Even for a tech demo, considering both the age and the specifications of the computer, this is an amazing recreation. 技術デモとはいえ、年代とコンピュータのスペックの両方を考慮すると、これは驚くべき再現だ。 (翻訳:deepl)