Rendering Patterns

Sprites, scrolling, screen effects

Patterns

Platforms

Sinclair ZX Spectrum

5 patterns

Write colours directly to attribute memory for fast, flicker-free graphics without touching pixel data.

Print ASCII characters to the screen using the ROM character set. Direct display file access for fast text rendering.

Convert a number (0-99) to two ASCII digits and print them. Essential for scores and counters.

Horizontal progress bar with colour thresholds — blue through yellow, red, to white. Useful for health, temperature, or timers.

Draw large seven-segment display digits using PLOT/DRAW. Cell-aligned with 1px outline. 10 DATA strings define all digits 0-9.

2 patterns

Manage multiple sprites in the OAM buffer. Update positions, hide unused sprites, and DMA transfer efficiently.

Load colour palettes into PPU memory at $3F00. Required setup for any NES graphics.

2 patterns

Build a copper list to set colours and sprite pointers. The foundation of all Amiga graphics programming.

Calculate and update Amiga sprite control words from X/Y coordinates. Position sprites anywhere on screen.

1 pattern

Cycle through animation frames with configurable timing. Walk cycles, explosions, idle animations.