SXFR
scsirate &= SXFR;
} else if (scsirate == (syncrate->sxfr & SXFR)) {
scsirate &= ~(SXFR|SOFS);
scsirate |= syncrate->sxfr & SXFR;
scsirate = (scsirate & SXFR) >> 4
if ((scsirate & SXFR) == 0x40
scsirate &= ~SXFR;