YANJEN joystick

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Interface type: Kempston Joystick
Manufacturer:
Year:
Compatible wih: Spectrum 16K, 48K, +48K, +128K, +2, +2A/+3
Notes:

   This joystick plug to Spectrum via expansion bus.

   Buttons: Spectrum kempton joystick only can have one button but this joystick have two. In fact there is only button; The difference within them is that one of them has a extra circuit to have "auto fire".

   How it works: In the middle of the board there is a big point that it's connected to GND. This point is also connect to joystick box, which it has conductive paint. When we touch a button, we close the circuit of the 4049 chip to GND.