Comment on Found a brand new, unused Pong console from 1979 in an Edinburgh charity shop for 20£
Treczoks@lemmy.world 1 day ago
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.
TimeNaan@lemmy.world 1 day ago
If it’s any indication, the manual says:
Image
Treczoks@lemmy.world 1 day ago
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.
TimeNaan@lemmy.world 1 day ago
Thanks for the explanation!
Treczoks@lemmy.world 1 day ago
You’re welcome!