VB_UMC
SiS_Pr->SiS_VBType |= VB_UMC;
if(SiS_Pr->SiS_VBType & VB_UMC) romptr += 12;
lcdpdcindex = (SiS_Pr->SiS_VBType & VB_UMC) ? 14 : 12;