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Chase

(★ 9)

A VIC-20 port of a classic Spectrum 3d forest chase game.

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- baked_pull_grid.png
- gfx_equates.asm
- gfx_index.json
- gfx_pool.asm
- tree_strips.asm
- tree_strips_verify.png
- turn_left_grid.png
- turn_right_grid.png
- convert_gfx.py
- extract_tap.py
- render_pull_grid.py
- render_tree_strips.py
- sort_lbl.py
.gitignore
bolt.asm
bonusenemy.asm
chase.asm
chase.prg
defines.asm
ending.asm
enemybikes.asm
explosion.asm
gameloop.asm
handlebar_source.txt
header.asm
init.asm
input.asm
make.bat
playerbike.asm
raster.asm
README.md
sectorchange.asm
sound.asm
title.asm
tree_movement_tables.asm
trees.asm
udg_source.txt
ui.asm
util.asm
warm.asm
zp.asm

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A port of the classic Spectrum 3d forest chase game for the VIC-20 with 8K RAM expansion.

It uses a raster split to change the background from sky to ground colour, because the VIC doesn't have per cell background colour. It also uses a lookup table to advance the trees and steer, which basically looks ahead in the tree map for a tree to pull forward and outward.
![Straight ahead pull table](https://raw.githubusercontent.com/Kweepa/Chase/main/build/baked_pull_grid.png)

This is faster than the two or three pass Spectrum approach, and easier to make perspective correct. The screen is 23x22, very close to the VIC default 22x23, but with a line right down the middle so that it looks symmetrical. It's quite a simple game, and there's about 2k free should someone want to tweak some things or add features.

## Running

Load `chase.prg` on a VIC-20 with 8K expansion (PAL). In VICE:

```text
xvic -pal -memory 8k +basicload -autostart chase.prg
```

Or run `make.bat` if you have ACME and VICE set up locally.