484 Demo by a1k0n
484 : Demo by a1k0n
- Author: Andy Sloane
- Description: Tiny Tapeout demo competition entry
- GitHub repository
- Clock: 48000000 Hz
a1k0n's tinytapeout08 demo compo entry
How it works
It's a standalone VGA+sound demo that fits in two tiles; you'll just have to see.
This was developed with a 48MHz clock, so it's in a funky VGA video mode -- it's standard 640x480@60Hz VGA timing and 4:3 aspect ratio, but with 1220 horizontal pixels instead of 640. All graphics are dithered down to RGB222 with a Bayer matrix which alternates each frame. Because of the dithering and the weird resolution, it looks best on a real CRT, but any VGA monitor ought to work.
Sound is generated using a 16-bit sigma-delta DAC on io7 from an internal 3-channel synth (triangle, noise, and square waves).
I will add more info here after the deadline passes, as the demo is in flux as I try to fit effects into 2 tiles...
How to test
Run clock at 48MHz, connect VGA and sound Pmods, and give it a reset pulse.
External hardware
Follows the democompo hardware rules:
TinyVGA Pmod for video on o[7:0].
1-bit sound on io[7], compatible with Tiny Tapeout Audio Pmod, or any basic ~20kHz RC filter on io7 to an amplifier will work.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | R1 | ||
| 1 | G1 | ||
| 2 | B1 | ||
| 3 | VSync | ||
| 4 | R0 | ||
| 5 | G0 | ||
| 6 | B0 | ||
| 7 | HSync | AudioPWM |