I came across this book only recently: Understanding and Expanding Your Amstrad CPC (https://archive.org/details/understanding-and-expanding-your-amstrad-cpc-464-664-6128-alan-trevennoracme/mode/2up) by Alan Trevennor, Sigma Press, 1986.
There are a few hardware projects in the book, including
- RS232 interface
- Speech synthesiser
- EPROM programmer
- ROM board
- ROM disk
- External keyboard interface
PCBs and kits for these projects were all offered for sale through a UK company at the time.
I wonder if anyone here had this book back in the day? And if you did, did you ever build any of the projects ?
I think I do recognize the cover (but no I didn't have it), so it must have made it to Greece at least.