INT 10 - Chips & Technologies Extended BIOS - SAVE/RESTORE SUPERVGA STATE
        AH = 5Fh
        AL = subfunction
            90h determine size of save buffer
            91h save state
            92h restore state
        CX = state mask (see below)
        ES:BX -> save buffer (subfunctions 91h,92h only)
Return: AL = 5Fh if function supported
            ---subfunction 90h---
                BX = number of 64-byte blocks required
            ---subfunction 92h---
                buffer at ES:BX filled
SeeAlso: AH=1Ch,AX=5F03h

Bitfields for state mask:
 bit 0  video hardware
 bit 1  BIOS data state
 bit 2  DAC state
 bit 15 type (0 all state info, 1 SuperVGA state only)

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