SF_IsM650
SiS_Pr->SiS_SysFlags |= SF_IsM650;
default: SiS_Pr->SiS_SysFlags |= SF_IsM650; break;
SiS_Pr->SiS_SysFlags |= SF_IsM650;
#define IS_SISM650 (SiS_Pr->SiS_SysFlags & (SF_IsM650 | SF_IsM652 | SF_IsM653))