Changes
/* Links */
*[https://youtu.be/DElx9pk2oks ZX81 advertisements]
*[https://problemkaputt.de/zxdocs.htm Noca$h's ZXdocs]
*[https://oldcomputer.info/8bit/zx81/ULA/ula.htm ZX81 ULA replacement]
*[https://youtu.be/1Jr7Q1yJOUM Documentary - The Sinclair ZX80, ZX81, and Timex Sinclair 1000] by [[The 8-Bit Guy]]
*[https://youtu.be/spxAQkTzvDQ Sinclair ZX81 (Timex 1000) Grandaddy of Computers] by [[Nostalgia Nerd]]
