One field of the VgaSavePtr2Rec points to a VgaDccRec. This structure is
initialized by the VGA video system BIOS to point to a table in ROM.
Information in this structure identifies valid combinations of video
subsystems which are supported by your VGA BIOS. For instance, your VGA
BIOS may support both an EGA and a VGA while mine won't.
See INT 10H 1aH for info on querying valid combinations and switching back
and forth between monitors.
Offset Size Contents
ßßßßßß ßßßß ßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßß
+0 1 bEntries entries in wCombos
+1 1 bVersion DCC table version number
+2 1 bMaxTypeCode maximum display type code
+3 1 res (reserved)
+4 2 wCombos a variable-length list of byte-pairs identifying
valid display combinations. For instance, 0108H
means supports a monochrome adapter and a color
VGA adapter. See INT 10H 1aH for codes.
4+(2*n) size of a VgaDccRec structure
See Also: VGA Data Areas
VGA I/O Ports