Bitfields for XGA mainframe type character attributes:
Bit(s)	Description	)
 7	blink double rate (75% ON time) or use color 8 as background
	(see AX=1003h)
 6	reverse video
 5	underlined
 4	left-most and right-most dots of underline area inverted
 3	foreground intensity/character font select
 2-0	foreground color
SeeAlso: #00014,#00036