Help identifying Mystery Hardware

Hey. Im not sure were to post this but..

My grandad recently died He was an electronics engineer and some of his stuff was sent to me for some reeason. Most of its pretty standard hardware excpet these mystery microchips i cant identify.

There are five and they have labels on them, i just cant find any information about them.

They look like CPU's but different.

Heres the labels on one of them for a starting point

"VISION
VV6800C001EB
81500
9643K"

Can any one help me find out what these are ?

Ill post the markings on the other chips if you need them.

Thankyou .