SCSI bus types From an electrical point of view, there are two
incompatible bus types: single-ended and differential. This
means that there are two different main groups of SCSI devices
and controllers, which cannot be mixed on the same bus. It is
possible however to use special converter hardware to transform
a single-ended bus into a differential one (and vice versa). The
differences between the bus types are explained in the In SCSI
related documentation there is a sort of jargon in use to
abbreviate the different bus types and speeds. Ultra: 40 Mbyte/s
FWD: Fast Wide Differential 20Mbyte/s FND: Fast Narrow
Differential 10Mbyte/s FN: Fast Narrow 10Mbyte/s SE: Single
Ended 5Mbyte/s Wide is a bit ambiguous, it can indicate 16 or 32
bit buses. The 32-bit variant is not (yet) in use, so wide
usually means 16 bit. Fast means that the timing on the bus is
somewhat different, so that on a narrow (8 bit) bus 10 Mbyte/s
are possible instead of 5 Mbyte/s for 'slow' SCSI. Ultra is
faster again by a factor of 2. It sh