Willem Aandewiel designed a tape device for the (micro)KIM. With a Wemos D1, ES8266 and ATTiny and some clever software to make the KIM believe a audio cassette recorder is connected.
All details here on Willem’s website.
The device in action:
https://youtu.be/R_zD5T_khKs
Willem has now published the next generation, together with a 32K RAM card, of this device.
See also:
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