mk2
mk2(bsbpb->bpbBytesPerSec, bpb.bpbBytesPerSec);
mk2(bsbpb->bpbResSectors, bpb.bpbResSectors);
mk2(bsbpb->bpbRootDirEnts, bpb.bpbRootDirEnts);
mk2(bsbpb->bpbSectors, bpb.bpbSectors);
mk2(bsbpb->bpbFATsecs, bpb.bpbFATsecs);
mk2(bsbpb->bpbSecPerTrack, bpb.bpbSecPerTrack);
mk2(bsbpb->bpbHeads, bpb.bpbHeads);
mk2(bsxbpb->bpbExtFlags, 0);
mk2(bsxbpb->bpbFSVers, 0);
mk2(bsxbpb->bpbFSInfo, bpb.bpbFSInfo);
mk2(bsxbpb->bpbBackup, bpb.bpbBackup);
mk2(img + MINBPS - 2, DOSMAGIC);
mk2(img + MINBPS - 2, DOSMAGIC);
mk2(de->deMTime, x);
mk2(de->deMDate, x);
mk2(boot0 + OFF_TICKS, t_arg);