Is this actually for the ZX81? AGF Joystick Interface II

[system11]

Resistors are 4.7M ohms(!)
Diodes are 1N4148.

Rest checks out.

[XavSnap]

Yellow, violet, red = 4,7k ohms
Yellow, violet, Green = 4,7M ohms
Yellow, violet, brown = 470 ohms

4,7k ohms seem a better choice.

[1024MAK]

Or 47kΩ (yellow, violet, orange then the tolerance, brown 1%, red 2%, gold 5%, silver 10% or none 20%).

I agree with Xav, 4.7MΩ is unlikely.

For pull up resistors (which these are), the typical range is 1kΩ to 22kΩ.

Mark

[system11]

Well they're yellow purple green, I even measured them because it seemed so unlikely.