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Bitfields for Cirrus Logic user options word

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Bit Description

1, 0

centering
00 vertical centered
01 from bottom
10 from top
11 reserved
3, 2 720-dot fix-up options
00 OR every 8th and 9th pixel
01 display MGA mode from left
10 display MGA mode from right
11 skip every 9th pixel
4 ???
7 - 5 video mode
00 CGA
01 MGA
10 EGA
11 VGA
8 external monitor enabled instead of LCD panel
9 vertical expand mode enabled
10 8-bit mode instead of 16-bit mode
11 normal video rather than reverse video (for LCD)
12 attribute automap rather than attribute emulation
13 bold mode disabled (default)
14 ???
15