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avr-ay-board
The replacement board for the AY-3-8910/AY-3-8912/YM2149F sound chip. Compatible with https://www.avray.ru project firmware.
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rc2014-ym2149
KiCad schematics and gerbers for a YM sound card for the RC2014. See it in action here: https://www.youtube.com/watch?v=-iLwi9FagFE
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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microbit-vgmplayer
This project uses a BBC micro:bit and external circuit to play BBC micro (SN76489) VGM sound files.
For cheap + available as jellybean from china assembly services, just using another microcontroller would be sensible, there are open source emulation projects for a lot of the popular retro chips, some that can even be drop-in replacements. Like if you want an AY-3-8912 there's this project that only needs ATmega48 + a few passives, https://github.com/Yevgeniy-Olexandrenko/avr-ay-board