DMNSonic

Thanks Fruit-bat for your tips. It worked! I never played with a ZX before so I didn't understand about the 48k and 128k differences. I found how to write "...

After a lot of tests and different PSUs I found the is the USB Hub. Tested two here and one doesn't work and the other causes this problem that I've...

Update: I'm gonna build a DB9 to use Atari-like joysticks but the Row and Columns combination just don't help that much. I saw many games use "Cursor" keys to play,...

Again many thanks for the help! I'll gonna make a DB9 based on this schematic because I had no luck with USB hubs.