POR column indicates whether a register has power on reset. A "N" indicates that the contents of a register are undefined at power on.
A colour in the palette is coded in 2 bytes:
* For first byte, bit7..4 is blue value, bit3..0 is red value
* For second byte, bit7..4 is ignored, bit3..0 is green value
Sprite magnification is coded in 1 byte:
* bit7..3 is ignored
* bit3..2 is X magnification (00 = not displayed, 01 = x1, 10 = x2, 11 = x4)
* bit1..0 is Y magnification (00 = not displayed, 01 = x1, 10 = x2, 11 = x4)
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