"Proportional Joystick interface" PCB from Fred Nachbaur [ZX-Appeal #Mar-Apr-89]
GERBER & Kicad project:
http://abandon.pcbs.free.fr/ZxAppeal.htm
Have Fun.
Proportional Joystick interface PCB [ZX-Appeal]
Proportional Joystick interface PCB [ZX-Appeal]
Xavier ...on the Facebook groupe : "Zx81 France"(fr)