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Score Sound

DanBoris

Entry posted by DanBoris

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The next couple of circuits are used to generate the sounds for the game. The first sound circuit is for the score sound. This sound is played whenever either player misses the ball.

 

 

 

When a player misses the ball the /MISS signal will go low which will trigger the 555 timer G4. When triggered the output of G4 will go high and stay high for 242ms at which point the output will return low. When the output of the timer is high the 32V signal will be allowed to pass through NAND C3 to the sound output. 32V comes from the vertical counter and has a constant frequency of 213Hz.

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supercat

Yay he's back!

 

Wouldn't the 32V signal be a bit warbly, since every fourth pulse would be six scan lines longer than the rest?

 

Incidentally, I wonder if anyone at Atari ever considered running horizontal slightly slow and vertical slightly fast, so as to have 256 lines/frame?

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DanBoris

Yes, you would get a little audio glitch once per frame, but it probably isn't too noticable, and using 32V saved them from having to add more chips just to generate pure tones for the audio. All the audio circuits in Pong get thier frequencies from counters that are already used for other things.

 

Dan

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