PORTIBM PC Portable (uses same BIOS as XT) 4AE8-4AE9 - 8514/A and compatible - CRT CONTROL
Notes:	supported by ATI Mach8 and Mach32 chipsets
	supported by S3 chipsets when PORTIBM PC Portable (uses same BIOS as XT) 03D4h register 40h bit 0 is set
SeeAlso: #P0749

4AE8w -W  CRT control: Advanced function control (see also #P1022)
	(02h = VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers. mode, 03h = 480-line mode, 07h = 768-line mode)


Bitfields for S3 8514/A-compatible Advanced Function Control register:
Bit(s)	Description	(Table P1022)
 15-7	reserved
 6	(928 only) enable Write Posting
 5	(928+) enable memory-mapped I/O
 4	(928+) enable linear addressing (see also #P0741)
 3	reserved
 2	(911-928) screen size (1 = 800x600 or 1024x768, 0=640x480)
	(Trio32/Trio64) enhanced modes pixel length (0 = 8+ bpp, 1 = 4 bpp)
 1	reserved (1)
 0	enable enhanced functions
Note:	bit 4 is ORed with CR58 bit 4; bit 5 is ORed with CR53 bit 4