| Host or Host Adapter | Name | Connector |
| Most SCSI SLOW (5 Mbyte/sec) computers and host adapters use the Centronics type 50-pin connector. Also some 8-bit Fast computers and host adapters. | CENT50 |  |
| Old Sun and DG Computers |
D50 |
 |
| Many 8-bit SCSI FAST (up to 10 Mbytes/sec) computers and host adapters use this 50-pin High-Density connector. |
HD50 |  |
| Apple/Mac and some older Sun 8-bit workstations. | D25 |
 |
| All FAST/WIDE (16-bit) SCSI-3 computers and host adapters plus old DEC single-ended SCSI use this 68-pin High Density connector. | HD68 |
 |
| New SCA 80-pin |
HD CENT80 |
 |
