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Int 10 Fn 4F04 - VESA SuperVGA BIOS - Save/restore Supervga Video State [V]
AX = 4F04h
DL = subfunction
00h get state buffer size
Return: BX = number of 64-byte blocks needed
01h save video states
ES:BX -> buffer
02h restore video states
ES:BX -> buffer
CX = flags for states to save/restore
bit 0: video hardware state
bit 1: video BIOS data state
bit 2: video DAC state
bit 3: SuperVGA state
Return: AL = 4Fh function supported
AH = status
00h successful
01h failed
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