Bitmap mode is made up of 8x8 tiles. The screen is 32x24 tiles, or 256x192 pixels. 2 colors per line per tile. So a single tile can contain up to 16 colors.

Bitmap mode is made up of 8x8 tiles. The screen is 32x24 tiles, or 256x192 pixels. 2 colors per line per tile. So a single tile can contain up to 16 colors. A single screen is divided into 3 separate tile maps, each 256 bytes long. It also supports 32 spirtes but only 4 sprites per scanline, which is its biggest limitation. The Sega Master System used an upgraded version of the 9918, adding 64 colors, smooth scrolling, and 8 sprites per scanline, all within the same 16 kB of VRAM.