ESP32 Rainbow

A ZX Spectrum single-board computer with a built-in keyboard and display

Available for pre-order

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Apr 15, 2025

Project update 13 of 14

PCBs Have Arrived!

by Christopher G

Fresh from PCBWay — four big boxes full of ESP-Rainbow 1.0 boards have landed! Super happy with the quality.

I’ve tested a few and everything is looking great:

Firmware Tweaks & Game Loading Made Easy

I’m just wrapping up some final firmware tweaks. One of my goals is to make it super easy to load games onto the device.

To do that, I’m building functionality directly into the website — you’ll be able to browse the games catalog and copy games straight to the onboard flash storage.

We’re using an ESP32S3 with 8MB of flash. The current firmware is just over 1MB, so there’s still room for:

And don’t forget, there’s also an SD Card slot — so you’ve got loads of extra space to play with.

Out in the Wild!

The team at Espressif reached out recently and asked to take one of the ESP-Rainbow boards on the road — here it is featured at their booth:

And here’s someone having fun with it:

Showcased at:

According to Espressif: "People were EXCITED about it."

We’re getting closer to launch — stay tuned!


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