A closeup of a ROM simm, with a pair of very tiny 24-pin DIP cassette decks soldered to the board. Inside them are very tiny BASF cassettes.
https://files.bitbang.social/media_attachments/files/111/756/047/497/152/153/original/8c58640fbad39b47.jpg
Early cassette-based ROMs never took off because of speed issues, and a lack of very tiny pencils.
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