SEGA Genesis, October 1988
Series : Space Harrier Developer : Sega Graphics : Bitmap-based 3D Achievements : retroachievements.org
not completed.
Image source: segaretro.org
Analysis
I looked at the VRAM while the game is running, and noticed that the grid is clearly present as tiles in VRAM. When the camera view is moving around in the same place, the tile data doesn't change. When the character moves forward, the tile data is updated for every rendered frame. I had assumed that the grid moved forward using color cycling, but that was wrong.
VRAM address $0620 - $3320 is rewritten for every frame rendered which means that 11 KB VRAM is updated every frame.
The background tile map is much bigger than the screen, and is not updated, it just scrolls with vertical movement, and is skewed (using per-line horizontal scroll offsets) with horizontal movement.
The player character, enemies, bullets, and blob shadows are sprites.