My Project of Cloning Pong:

Back when I was 11, I wanted to buy some arcade games off Ebay. My parents told me they didn't want me to do that.

I asked them if they would be okay with me buying the TTL logic chips and cloning Pong. They were okay with that.

So, over the next few months I saved up to buy all of the logic chips.

When the logic chips arrived, I started to clone Pong using these schematics redrawn by Dan B.

When using these schematics, I would like to point out that some of the parts in the paddle circuit are wrong, so be sure to compare them to the original schematics.

After "finishing" the project, several things were evident:

  1. The score was being repeated all over the screen.
  2. Each player had ~32 paddles.
  3. Paddles would touch the bottom of the screen.
  4. The clock circuit would crash when the ball would hit a paddle.
  5. Game would not coin up.
  6. ...and others I'm not too sure how to describe!

Here are some thoughts as to what caused most of the problems:

For problem 1: I learned there is a big difference between a 744852 and a 7448. One is CMOS, one is TTL.

For problem 2: I think I bridged 4H with something...

For problem 3: I think something degraded in the paddle circuits, because it wasn't always this way.

For problem 4: I must have bridged something with the clock signal.

For problem 5: I probably soldered something into the wrong position.

For problem 6: Either A). I need to find the words to describe it. OR B). I need some way to jog my memory.


I also made some other mistakes:

I used a SPDT switch instead of a DPDT switch.

I was routinely unbridging connections, so I probably missed something.

Other things about the project:

I used over 300 feet of wire.

We cleaned several Radio Shacks out of those perfboards.

We probably ended up spending over $300 to do it just because of the prices at Radio Shack.

I also had recently gotten a label maker so I used it to label major signals.


This page was last updated 7/7/2018