CN50 Male

CN50 Female

Centronics C50  sometimes referred to as CN50, Cent50  (External connector on many SCSI-1 and some SCSI-2 Controllers) The controller connector and peripherals connectors should be females, and the cables male.

DB50 Male
SCSI-1
Usually used on old Sun Sparcstations.

DB50 Female

DB25 Male
SCSI-1
Used with the Mac, Zip drives, and many scanners.

DB25 Female

Male DB37

SCSI-1

Female DB37

HPDB50 Male
Mini D50 “HPDB50” (SCSI-2/SCSI-3 external connector) . The easy way to tell the difference between an HPDB50 and an HPDB68 (unless you want to count those tiny little pins) is to measure them. HPDB50 is about 1 3/8” (36mm) , and the HPDB68 is about 1 7/8” (47mm)

HPDB50 Female

HPDB68 Male
MiniD68 “HPDB68” (Ultra wide SCSI-3/ Ultra2 LVD SCSI/ wide Differential SCSI both internal and external) The internal and external connectors appear to be different, but they are the same basic connector. The easy way to tell the difference between an HPDB50 and an HPDB68 (unless you want to count those tiny little pins) is to measure them. HPDB50 is about 1 3/8” (36mm) , and the HPDB68 is about 1 7/8” (47mm).

HPDB68 Female

VHDCI 0.8mm HPCN68 male- picture is slightly larger than lifesize!

HPCN50 pin (rare)

Type of SCSI

"Single-ended" (Regular) SCSI bus length

"Differential" SCSI bus length

LVD SCSI  bus length

5 MHz (SCSI-1)

 6 meters

25 meters

-

10 MHz (SCSI-2 FAST, Fast / Wide SCSI)

3 meters

25 meters

-

20 MHz (Ultra SCSI,  Ultra Wide SCSI or  "Fast20")

3 meters (3 devices + host adapter) or 1.5 meters (4 devices + host adapter)*

25 meters

-

40 MHz (Ultra2 SCSI or  "Fast40")

-

-

12 meters