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chip8-test-suite
A collection of ROM images with tests that will aid you in developing your own CHIP-8, SUPER-CHIP or XO-CHIP interpreter (or "emulator")
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InfluxDB
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You can find the emulator here: CHIP-8 Emulator (bobbynarvy.github.io) and the source code here: bobbynarvy/chip-8: A CHIP-8 Emulator (github.com)
The emulator still has issues but it is largely usable. It passes most of the tests in test ROMs that I have found, in particular the ones here. It also has a simple debugger that actually helped me find issues in my implementation.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.