I'm glad to join this forum, I recently purchased an ZX81 that was my first home computer when I was young. Actually I'm doing some hardware modifications and that's why I come here to read and learn about.
Hello Papalapa. A warm welcome to Sinclair ZX World. We do have lots of posts and threads here talking about various hardware modifications...
Please do feel free to tell us all about what you want to do, or are doing or have done. Photos of your machine showing the modifications are also welcome