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OpenTendo
An Open-Source HardWare (OSHW) recreation of the original 1985 front-loading NES Motherboard
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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.
I think PCBs themselves are easier. There's a few projects that recreate the PCB for the NES, but require you to transfer working chips from a real NES. It's getting the actual chips that's harder to manufacture in smaller quantities. Definetly helps preserve the working actual consoles.
NOTE:
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Hence, a higher number means a more popular project.