The very first pong game system did not use software, which blows my mind. OP's does not appear to be the same version but it's possible this it also does not use software.
we had an all black console that is like halfway between that the whats in the OP. it had wired controllers and 4 versions that you cycled through to choose. I think it was pong, doubles pong, hockey, doubles hockey. hockey being pong where you had to get it in the goal in the 20% of the middle of your opponents end but the other 80% was just like the side walls.
I have a Binatone one in a crate here with essentially the same selection of games on it. It was a really common thing to clone, there was one chip that played them all.
I wonder about the "Colour". Did they actually use the different video outputs of the AY-3-8500 chip for controlling different colour signals instead just joining them as a luminance signal?
For those too young to know: The AY-3-8500 (or AY-3-8500-1 fo NTSC) chip is at the heart of almost all of those pong-type consoles. It has a number of different (but synchronized) video outputs for left player, right player, ball, numbers, and playing field, and most consoles just or'ed them together into luminance (Y) to make a simple B&W image. You could route some signals to the R-Y and/or the B-Y signal to give them some basic color, e.g. if you sent the "ball" signal both to the luminance and the red (R-Y) channel, you would get a red ball. All this needs are a handful of simple logic gates.
It basically tells you that you can basically tone the "colourness" (i.e. the brightness of the colours) up and down, which was a normal control (like brightness and contrast) back then. This is not about being able to make a red playing field green by some setting on the TV. You just had some potentiometers to play with the pre-amplification of the luminance and colour signals.
What could be in the instructions would an explanation of the games telling you that e.g. the playing field is green and the ball is red or somesuch, then they actually did a (rare) "colour implementation" of the circuit.
If you are interested, there is a number of interesting documentations on this pong chip on the net.