136 John Pong The Second
136 : John Pong The Second
- Author: Sophia Rustfield (Representing HSWAW)
- Description: a hyper simple pong game with the polish pope taking the role of the ball outputted over vga
- GitHub repository
- Clock: 25175000 Hz
How it works
it outputs VGA, using all of the dedicated output pins and three of the bidirectional pins, and takes player input on 5 of the dedicated input pins, it works by having a counter that counts clock cycles since boot, and outputs one pixel per clock cycle, on the first clock cycle of vsync, all game logic happens.
How to test
you're gonna need to play the game, and hook it up to a monitor with a DAC
External hardware
- a circuit that can convert the digital output to analog VGA
- a monitor that supports VGA
- a circuit for some buttons for the player input there are no part numbers here because we built everything outselves except for the monitor, and monitors are ubiquotus
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | move paddle up | red channel bit 0 | blue channel bit 0 |
| 1 | move paddle down | red channel bit 1 | blue channel bit 1 |
| 2 | move player 2 paddle up | red channel bit 2 | blue channel bit 2 |
| 3 | move player 2 paddle down | green channel bit 0 | |
| 4 | high voltage to activate player 2, low for ai | green channel bit 1 | |
| 5 | green channel bit 2 | ||
| 6 | horizontal sync signal | ||
| 7 | vertical sync signal |