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ZX2040 review

Free#21 of 23 in ZX Spectrum Emulators

A focused open-source emulator for building portable ZX Spectrum 48K hardware.

7.1/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

ZX2040 is open-source firmware for emulating the ZX Spectrum 48K on Raspberry Pi Pico RP2040 hardware. It is aimed at compact, portable projects built around devices such as the Pimoroni Tufty 2040 and PicoCalc, with the Tufty 2040 serving as the reference device. The project combines emulation with a game-selection interface, configurable button and key mappings, Z80 snapshot loading, display handling, and audio output.

Its strongest fit is the hardware ecosystem. ZX2040 supports ST77xx displays over SPI or 8-wire parallel interfaces, five-button input, piezo speaker output, and Kempston joystick mapping. Real-time video upscaling and downscaling help adapt the Spectrum display to compact screens, while optional partial display updates provide another way to manage screen rendering. Audio output uses the RP2040 second core, and games can be uploaded to Pico flash for access from the device. These features make the project more than a basic emulator core for an RP2040 build.

The trade-off is a deliberately narrow scope. ZX2040 explicitly emulates only the Spectrum 48K model and uses .Z80 snapshots, so it is best suited to projects centered on that specific system and hardware format. It is firmware for RP2040 boards rather than a conventional desktop or mobile application, which limits its relevance for users seeking a general-purpose software emulator. Choose ZX2040 when the goal is a custom Pico-based display device with physical controls, local game storage, and focused 48K emulation; choose a broader emulator for other Spectrum models or standard computer and mobile environments.

ZX2040 pros and cons

  • Where it wins
    • Open-source ZX Spectrum 48K emulation
    • Supports ST77xx displays and configurable controls
    • Loads .Z80 snapshots and games into Pico flash
  • Where it doesn't
    • Limited to the Spectrum 48K model
    • Requires RP2040-based hardware
    • Designed for embedded devices, not desktop or mobile use

ZX2040 fact sheet, pricing and score →

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