This is what is called sync-code. The code runs in sync with the display and changes hardware switches at precise location of the display.

The instructions in red are the buffer switches, taking place during HBL. Every two lines of code run in exactly one scanline time.

Between them, in green, the code updates the framebuffers' content for the effect to move.

‪It’s time for your weekly dose of ‬

‪beta by Still‬
‪Windows, 2011‬

‪ ‬

‪ youtu.be/iTce0Vq_UvQ

Download: demozoo.org/productions/18319/

2010-2019 selection

Windows
Ceasefire (all falls down..) by Carillon, Cyberiad & Fairlight
(2010)

youtube.com/watch?v=NaPPHUt4K3

2010-2019 selection

Windows, 64kB
Offscreen Colonies by Conspiracy
(2015)

Also available in VR on Steam and Oculus!

youtube.com/watch?v=PaNYOzwlVC

2010-2019 selection

SEGA Mega Drive
Overdrive 2 by Titan
(2017)

This demo uses undocumented debug features of the console.

youtube.com/watch?v=gWVmPtr9O0

2010-2019 selection

Sony PlayStation 2
Cruisin 3 by Abyss
(2013)

(PS2 with composite video plugged on an oscilloscope)

youtube.com/watch?v=er8CoAAmv2

2010-2019 selection

MS-DOS
8088 MPH by Hornet, CRTC & Desire
(2015)

Runs on original 8088 IBM PCs with CGA video card!

youtube.com/watch?v=hNRO7lno_D

2010-2019 selection

Nintendo Game Boy Color
It Came from Planet Zilog by Phantasy
(2015)

youtube.com/watch?v=If2xW3IW-L

2010-2019 selection

Atari VCS 2600
Chiphead by Altair
(2016)

A remix of the PC demo "Ziphead"

youtube.com/watch?v=1nTRMTnTeL

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