Mattel Aquarius
The Mattel Aquarius computer has only a text mode with 40×24 characters, which graphic mode is obtained from low resolution blocks, providing a 80×72 resolution. The colour attribute area is also on this 40×24 characters area, and used from a pixel group of 2×3. The colours used in the palette are fixed and 16.
Read more about this topic: List Of 8-bit Computer Hardware Palettes