Actually you can display one full screen bitmap. Vram can hold 384 tiles, and the screen needs 360 tiles. It's gonna be difficult to update that, since there's

Actually you can display one full screen bitmap. Vram can hold 384 tiles, and the screen needs 360 tiles. It's gonna be difficult to update that, since there's no more vram for double buffering, you can only access vram during vblank and hblank, and there's no dma into vram (on the gbc it's possible, since it has a dma and double the vram).