CR45
unsigned char CR40, CR41, CR42, CR43, CR45;
reg->CR43 = reg->CR45 = reg->CR65 = 0x00;
vga_out8(0x3d5, reg->CR45, par);
reg->CR45 = vga_in8(0x3d5, par);
vga_out8(0x3d5, reg->CR45, par);