Compatibility: VGA
Expects: AH    12H
BL    32H
AL    setting: 00H enable access
01H disable access
                                                                  
Returns: AH    12H if a valid value was passed in AL
                                                                  
Info: You can use this to suppress CPU access to video RAM and I/O
ports on VGA-compatible displays.  It updates bit 0 of the
VgaFlagsRec (at 0040:0089).

Notes: You can disable an EGA card via bit 1 of port 3c2H.

See Also: INT 10H 12H (EGA/VGA Special Functions/Alternate Select)
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INT 10H 12H BL=32H: Enable/Disable Video RAM & I/O Ports