[dr.wily]

Yes ! You’r right. Indeed pin 20 was not connected, I thought according the diagram that pins 20 et 21 had the same purpose and I connected only pin 21 to provide power to paddle. Now it works flawlessly.

Very thank for your help and your work and effort to resitute this first video game.

[dr.wily]

Pin 20 shows 0v

pin 21 shows 4.3v

[dr.wily]

I feed with 5v provided by a PC PSU, but I can test with batery.

Ground connection is OK, my multimeter show 0 ohm everywhere on ground circuit

When no buttons are pressed the ball don’t move, floats and falls automatically after 30s.

I wonder if it comes from pot. I bought this one : http://www.newark.com/bi-technologies-tt-electronics/p160knp-0qc20b10k/potentiometer-linear-10kohm-200mw/dp/34R4721?Ntt=1760793

I plug wires like this :

– brown (ADC) in center
– green (GND) at left
– orange (VCC) at right with 10k resistor

On button :

– blue (PC) with 10k resistor
– green GND

V+ is independent on each paddle or can I use one V+ for both ?

[dr.wily]

Yes, I have mounted the 10k resistor and the push button is open type.

On the right player side, PC5 pin shows :

– 4.3v when button is open

– 0v when button is pushed

[dr.wily]

Thank for your help ;)

The range of the paddle don’t change. The ball always goes to the opposite side. I notice when paddle is unpluged, scope displays the ball that changes side continuously, like if the players always pushed the button. But same thing, ball goes in the wrong way. 

I have good voltage on ADC lines from 0 to 5v when I turn the knob. Other thing, at the serve :

at the left side, ball goes on upper left.
at the right side, ball goes to bottom right.

Both paddles share the same vcc and gnd. It’s good ?

[Author]

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