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In the discussion of the ball horizontal control circuit, supercat proposed a simplified circuit that would perform the same function. This is the circuit I believe he is describing:
It actually comes pretty close to working, and it does use less chips, but instead of generating 3 speeds it generates 4.
The VSYNC input will make sure the circuit is only enabled for the first four lines on the screen. For each count on the hit counter the MOVE signal will be enabled for either 1,2,3 or 4 lines as follows:
Count Move high on line(s)
0-3 2
4-7 1,2
8-11 2,3,4
12-15 1,2,3,4
I may still be possible to modify this further to get it to work exactly like the original Pong worked.
It actually comes pretty close to working, and it does use less chips, but instead of generating 3 speeds it generates 4.
The VSYNC input will make sure the circuit is only enabled for the first four lines on the screen. For each count on the hit counter the MOVE signal will be enabled for either 1,2,3 or 4 lines as follows:
Count Move high on line(s)
0-3 2
4-7 1,2
8-11 2,3,4
12-15 1,2,3,4
I may still be possible to modify this further to get it to work exactly like the original Pong worked.
