# The Raistlin Papers

> C64 demoscene coding at the cutting edge of retro technology: 6502 effects, raster tricks, IRQ loading and SID music from Genesis Project demos.

Every post is available as markdown by adding `index.md` to its URL; those links are given below. Article text and code are licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); code is also available as MIT. Cite as: Raistlin, *Post title*, The Raistlin Papers, URL, date.

## Posts

- [Sprite Interleave](https://c64demo.com/sprite-interleave/index.md): A gap-free carpet of sprites on the C64: no interleave against 16px and 20px interleave, badline timing, and fast sprite pointer updates. (2026-10-12)
- [Seamless Loading in No Bounds](https://c64demo.com/seamless-loading-nobounds/index.md): How No Bounds hides loading on the C64: background loading with Sparkle, transitions that cover the disk, clean IRQ handovers and music sync. (2026-10-11, series: No Bounds)
- [Welcome to SIDBlaster](https://c64demo.com/welcome-to-sidblaster/index.md): SIDBlaster, a tool that emulates C64 SID tunes to trace every memory access, so it can relocate, disassemble, optimise and link them to players. (2025-05-06)
- [X 2023 Demo Compo - A Look Back](https://c64demo.com/x-2023-demos/index.md): A look back at the X 2023 C64 demo compo: the top 5 demos, from Next Level by Performers to Multiverse by Nah-Kolor, with my scores. (2023-11-27)
- [Remastering Sabre Wulf - Part Two](https://c64demo.com/remastering-sabre-wulf-part-two/index.md): Sabre Wulf Remastered part two: reading the C64 keyboard and joystick, 16-bit player movement, and driving Sabre Man's animations. (2023-10-24, series: Remastering Sabre Wulf)
- [Remastering Sabre Wulf - Part One](https://c64demo.com/remastering-sabre-wulf-part-one/index.md): Starting Sabre Wulf Remastered on the C64: why we rewrote the game, converting the map to LDtk, and a screen blit at twice the speed. (2023-09-13, series: Remastering Sabre Wulf)
- [Scrolling Bob Scroller](https://c64demo.com/scrolling-bob-scroller/index.md): How the No Bounds bob scroller repeats on a diagonal: one shape plotted to a C64 charset, ten screens and $d018 doing the scrolling. (2023-06-08, series: No Bounds)
- [Finite Bobs](https://c64demo.com/finite-bobs-nobounds/index.md): The finite bobs part from No Bounds: a bob trail plotted into charsets over an AGSP-scrolled C64 background, restored behind it as it goes. (2023-06-05, series: No Bounds)
- [Stopping Music Popping](https://c64demo.com/stopping-music-popping/index.md): Finding and fixing uneven music play calls in C64 demos, using VICE monitor traces to spot missed, doubled and drifting calls. (2023-06-01, series: No Bounds)
- [Side Border Bitmap Scroller](https://c64demo.com/side-border-bitmap-scroller/index.md): The Memento Mori end part: a bitmap scrolling through the C64 side borders at 25fps while streaming from disk with Sparkle and SPOT. (2022-12-03, series: Memento Mori)
- [Big Animating Sprite Logo](https://c64demo.com/big-animating-sprite-logo/index.md): How the big animating Genesis Project sprite logo in Memento Mori works on the C64: a 20px interleaved sprite carpet and delta-blitted frames. (2022-04-13, series: Memento Mori)
- [Big Layered Logo Mover](https://c64demo.com/big-parallax-logo-mover/index.md): How the huge swinging Memento Mori logo works on the C64: a packed charset logo over an x-expanded sprite layer, with interleaved IRQ code. (2022-03-30, series: Memento Mori)
- [Star Wars Scrollers](https://c64demo.com/star-wars-scrollers/index.md): How to make a Star Wars scroller on the C64 with bit-picked font data and cyclic scroll buffers, plus a short history of the effect. (2022-03-22)
- [DXYCP Scrollers](https://c64demo.com/dxycp-scrollers/index.md): DXYCP scrollers on the C64: pre-shifted fonts, generated LDA/ORA/STA plot code, and plotting to bitmap, charset or multiplexed sprites. (2022-03-20)
- [All Border Double DYPP](https://c64demo.com/memento-mori-all-border-double-dypp/index.md): How the all-border double DYPP in Memento Mori works on the C64: open borders, multiplexed sprites and prebaked, deduped font data. (2022-03-15, series: Memento Mori)

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