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jsmoo
Multi-system, pure JavaScript (& a little AssemblyScript) emulator, with great accuracy and speed. Currently some SNES, NES, GameBoy, Master System, ZX Spectrum, and GameGear support
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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.
My current, terrible, poorly-made code can be found at https://github.com/raddad772/jsmoo , with work on generating code and getting things accurate mostly focused on w65c816_generator.js , if you want to take a look.
For 68k there's also the cputester written by Toni Willen of WinUAE fame, which is extremely elaborate. For cycle accuracy testing you either need (pretty good) amiga custom chip support or modify the test program. FWIW he's working on an IPL accuracy tester, but the timing of some instructions are still being worked on.
I've been using tests from here: https://github.com/PeterLemon/SNES/