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ProcessorTests
A language-agnostic JSON-encoded instruction-by-instruction test suite for the 8088, 68000, 65816, 65[c]02 and SPC700 that includes bus activity.
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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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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
As part of development of JSMoo, my multi-system emulator, I implemented a series of 1,000+ tests per possible valid opcode (including undocumented opcodes). These tests are inspired by the amazing work of Tomas Harte at https://github.com/TomHarte/ProcessorTests , and after some people exercise them a bit I'd like it to be integrated there if he agrees.
If anyone else wants a look, it's part of the JSMoo repository at https://github.com/raddad772/jsmoo under "Generated Tests/z80/v1." Any feedback appreciated!