This is a proven working project.

The original project can be found here : https://github.com/grzegorz-gr/vga4cpc

Kudos and credits to the original creator.

"The goal of this project was to build a scandoubler for Amstrad CPC that is cheap, simple to build and can handle the most popular tricks that Amstrad software does (e.g. smooth scroll) that standard scandoublers usually don't support.

It should work with most LCD monitors. It supports 50.08 FPS to make animations look smoother, but there is also an option to use 60 FPS, if your monitor does not support low frequencies."

I have redesigned the PCB for SMD component use, smaller PCB and better signal integrity.

After (or before) building the PCB you just need to upload the software to RPI Pico. Connect it with USB cable to PC/Mac, keeping the small button on Pico board pressed. It should mount as a storage device. Just copy uf2 file there. Pico should unmount and restart then.

Firmware for the Pi-Pico can be downloaded from the Github site.

After switching it on, the board should porvide a test-pattern on the VGA output. You can check if everything is OK with the picture.

It will switch to normal output when it detects a video signal on the input.

Sometimes it can mess up the picture and/or produce a blank screen when a game switches resolution. In that case, just press the RESET biutton.

For the connection to the CPC, you can use the video output DIN6 connector, or you can solder the wires directly to the CPC board ( not recommended ). CPC Video output pinout can be found easily on the internet.

The 2pin header with a jumper on it provides selection between 50/60Hz mode. Experiment with it to get the best result for your monitor.

Output is standard VGA 15pin

The board needs to be powered via the USB port of the Pico. You can use any cheap 5V USB phone charger.