- DB25 Male to HP50 (Half Pitch 50) Male
-
DB25 Male - Used for parallel, serial or scsi applications: modem, null modem, laplink, printer,
scanner, removable storage drive, Apple scsi. The DB25 connector has 25-pins arranged in
two rows one on top of the other. The top row has 13 pins and the lower row has 12 pins.
-
Half Pitch 50 Male (Micro DB50 Male) - Used for scsi-2 applications: scanner, removable storage drive, controller, external
cdr/cdrw. The Micro DB50 connector has 50-pins arranged in two rows one on top of
the other. The top row has 25 pins and the lower row has 25 pins. Most 8-bit SCSI FAST
(up to 10 Mbytes/sec) computers and host adapters use this 50-pin High-Density connector.
Commonly used on Apples and Mac, and some older Sun 8-bit workstations. This connector is seen increased use on Scanners
and Iomega Zip Drives.
- Macintosh to SCSI 2
- SCSI 2 - This standard was introduced in 1989 and gave rise to the Fast SCSI and Wide SCSI variants.
Fast SCSI doubled the maximum transfer rate to 10 MB/s and Wide SCSI doubled the bus width
to 16 bits on top of that (to reach 20 MB/s). However, these improvements came at the
minor cost of a reduced maximum cable length to 3 meters. SCSI-2 also specified a 32-bit
version of Wide SCSI, which used 2 16-bit cables per bus; this was largely ignored by SCSI
device makers because it was expensive and unnecessary, and was officially retired in
SCSI-3.
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SC17-3
