NEC D3741, 134-500564-599 SCSI Hard Drive Disk Pioneer SCSI Software Wordperfect

Description

This was used when computers and software started to be used in consumer electronics repair and alignment. This was very expensive item my dad had to have in the early 90s to service Pioneer. My dad is not much help with specifics, believes much was used for laser disk. I also am no computer guy, like my dad we just learned what was forced on us. The old computers he had while servicing then have all gone away. He held on to this because he knows it has valuable service info on it, and cost him plenty. So if you can add anything to this item, I am all ears.
What I can see:
NEC Disk Drive D3741
134-500564-599
This is listed for my father, who owned a high end video and audio repair center in Milwaukee area.  It is time to sell his final pieces of test equipment and repair parts for what is now vintage electronics.  This stuff has been well taken care of and never abused. .