In Apple ][ hires graphics, the 280 pixel-wide display area was really 140 pixels with the extra resolution coming from sub-addressing the RGB pixels on the dis

In Apple ][ hires graphics, the 280 pixel-wide display area was really 140 pixels with the extra resolution coming from sub-addressing the RGB pixels on the display. On a black and white display you got the full 280 pixels but in color you would get weird color fringing happening. Even more fun was that one byte of memory was mapped to 7 "pixels" with the high bit indicating how the RGB sub-pixels would be split into the left and right halves of the pixel. Technologically it was rather cool, although it was a challenge to program against.