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        <title>vertige (Amiga 500) — 24 KB vibedemo on a bootable floppy</title>
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        <description>"vertige" remade for a stock Amiga 500, the 1987 home computer: 68000 CPU at 7 MHz, 512 KB of memory, no expansion. Same score (techno at 140 BPM in A minor), same structure and the same endless dive from one satellite into the next, over 2:00. It ships as a floppy that boots on its own, without Workbench or any operating system, like the demos of the era. The program is 24 KB (24,486 bytes), on an 880 KB floppy that is almost empty. Everything the PC version computes with raymarching was rebuilt with the Amiga's custom chips: – the blitter draws the rings and spheres as wireframes, with three levels of nested satellites; – the copper builds the mercury ocean and the mirror ceiling by choosing, line by line, which line of the image to display. It also makes the waves ripple, and every kick drum makes them swell; – the nebula, the stars and the gas giant are dithered, and the copper changes their colors on every line; – the music is synthesized at startup, with no stored samples, and played on Paula's four 8-bit voices. Captured in the FS-UAE emulator (A500 configuration), at 50 fps PAL. PC version: see "vertige" on this channel. https://git.coopix.eu/public/demo_test</description>
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