On Nov 3, 2010, at 7:42 PM, Doug McNutt wrote:
What is an HD50 connector?
It is the single-byte ("SCSI-N") version of the two-byte ("SCSI-W")
HD68 connector.
Both were codified in the SCSI-2 standard.
The large Amphenol 50-pin (incorrectly called "Centronics") and the
smaller MIL-Spec 25-pin D-Subminiature (actually a "Cannon Electric"
design) were never officially part of the SCSI-1 specification.
The 50-pin and 68-pin HD connectors ARE part of the SCSI-2
specification.
A card which I have had very good luck with is the Adaptec
AHA-2930CU, which is Apple part number 1719309-00 A, and has a Mac
BIOS with a checksum of EEC8.
The external connector is a SCSI-2 HD50 type, and the internal
connector is a 50-pin ribbon type.
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