CR66
unsigned char CR60, CR63, CR65, CR66, CR67, CR68, CR69, CR6D, CR6F;
reg->CR66 = 0x89;
vga_out8(0x3d5, reg->CR66, par);
reg->CR66 = vga_in8(0x3d5, par);
vga_out8(0x3d5, reg->CR66, par);
viafb_write_reg(CR66, VIACR, cr66);