ARRAY_VID1
bootpref[ARRAY_VID1] |= VID1_INTERLACE;
bootpref[ARRAY_VID1] &= ~VID1_INTERLACE;
writeNVRAM (fd, NVRAM_VID1, bootpref[ARRAY_VID1]);
bootpref[ARRAY_VID1] = readNVRAM (fd, NVRAM_VID1);