POR column indicates whether a register has power on reset. A "N" indicates that the contents of a register are undefined at power on.
There is only one pixel per byte in sprite image data. Bits3..0 of each byte define the palette index for this pixel. Bits7..4 are ignored.
Sprite magnification is coded in 1 byte:
* bits7..3 are ignored
* bits3..2 are X magnification (00 = not displayed, 01 = x1, 10 = x2, 11 = x4)
* bits1..0 are Y magnification (00 = not displayed, 01 = x1, 10 = x2, 11 = x4)
A colour in the palette is coded in 2 bytes:
