SEI : LDA #$7F : STA $DC0D : CLI → INTERRUPTS HOOKED

[05] THE DEMOSCENE

Raster interrupts, cycle-counting & digital subculture

Hacking the Hardware

What began as intro crackers blossomed into the first UNESCO-recognized digital subculture: The Demoscene. On 8-bit systems, coders exploited undocumented machine instructions (illegal opcodes) and cycle-exact timing.

Border-Busting (Open Borders)

Toggling VIC-II 24/25-row and 38/40-column registers ($D011/$D016) at exact cycle intervals tricks the video chip into omitting screen border blanking.

FLI & IFLI (Flexible Line Interrupt)

Manipulating color RAM every rasterline unlocks higher color densities beyond official multicolor mode limits.

Legendary Groups & Productions

Fairlight (FLT): Founded 1987 in Sweden. Setting milestones in styling, scroll routines, and elite coder attitude.
Triad: Swedish demo giants celebrated for technical breakthroughs and essential scene utilities.
Booze Design: Creators of Edge of Disgrace (2008)—delivering high-speed 3D rendering and video streaming on a stock 1 MHz machine.
Crest: German demogroup led by Crossbow, renowned for inventing Variable Screen Positioning (VSP) techniques.

Scene Databases

CSDb (C64 Scene Database) The definitive repository for releases, scener handles, tools, and music. Demozoo Comprehensive cross-platform demoscene registry.