SPECTRUSTY is a Rust library for building highly customizable emulators of several ZX Spectrum computer models and clones. Perhaps even more.

The Rust language allows you to easily compile your programs on many different platforms. Besides the native environments, Rust supports WebAssembly out of the box and can make your applications available on a thousand different devices. Check out this WebAssembly emulator example. It runs pretty well on mobile too.

Here you’ll find:

• Z80 CPU - An emulator of the Central Processing Unit in a few variations: NMOS, CMOS, and BM1 (dubbed “flavours”).
• Sinclair Ferranti ULA (Uncommitted Logic Array) - 16k/48k and 128k version of ZX Spectrum core chipset emulator.
• Amstrad Gate Array ULA (or AGA) - +3/+2A version of ZX Spectrum core chipset emulator.
• ULAplus core chipset extension as a wrapper of any of the above chipsets.
• SCLD by NCR Corporation for Timex TC2048/TC2068/TS2068 series core chipset emulator.

as well as peripheral device components, file format utilities, and more.

See the full list of available features.

If you want to see a step by step introduction on how to build your emulator using SPECTRUSTY, see the tutorial.

Otherwise, if you like to jump straight into the deep end, here are examples of fully functional emulator programs. There is also an example of a high-level emulator library, providing a selection of a few packaged computer models with a bow on top.