Effects · 9 posts

How individual demo effects work, with the code.

22 March 2022 Effects hard

Star Wars Scrollers

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.

12 October 2026 Effects intermediate

A gap-free carpet of sprites on the C64: no interleave against 16px and 20px interleave, badline timing, and fast sprite pointer updates.

03 December 2022 Effects insane

The Memento Mori end part: a bitmap scrolling through the C64 side borders at 25fps while streaming from disk with Sparkle and SPOT.

Series: Memento Mori

08 June 2023 Effects intermediate

How the No Bounds bob scroller repeats on a diagonal: one shape plotted to a C64 charset, ten screens and $d018 doing the scrolling.

Series: No Bounds

15 March 2022 Effects insane

How the all-border double DYPP in Memento Mori works on the C64: open borders, multiplexed sprites and prebaked, deduped font data.

Series: Memento Mori

05 June 2023 Effects hard

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.

Series: No Bounds

20 March 2022 Effects hard

DXYCP scrollers on the C64: pre-shifted fonts, generated LDA/ORA/STA plot code, and plotting to bitmap, charset or multiplexed sprites.

13 April 2022 Effects intermediate

How the big animating Genesis Project sprite logo in Memento Mori works on the C64: a 20px interleaved sprite carpet and delta-blitted frames.

Series: Memento Mori

30 March 2022 Effects hard

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.

Series: Memento Mori