Sharp X1

The X1 (エックスワン, Ekkusuwan), sometimes called the Sharp X1 or CZ-800C, is a series of home computers released by Sharp Corporation from 1982 to 1987. It is based on a Zilog Z80CPU.

The RGBdisplay monitor for the X1 had a television tuner, and a computer screen could be superimposed on TV. All the TV functions could be controlled from a computer program. The character font was completely programmable (PCG) with 4-bit color, and was effectively used in many games. The entirety of the VRAM memory was mapped on to the I/O area, so it was controlled without bank switching. These features made the X1 very powerful for game software.