Rockwell pps/4 possible manufacturing rejects?

[mazzlogic]

I need the help of some of you experts here! I came across eight ICs that I have identified as from Rockwell's PPS/4 family. What is intriguing is they have what appears to be a pin carrier still attached. I am thinking these could be manufacturing rejects because they also to have the part number printed on the opposite side from what I am seeing in photographs. Has anybody here ever seen anything like this before?

[CPUShack]

This is normal, they are just unfinished, still with the lead frames attached.

Markings would be added on top later (they usually had markings on BOTH dies)

These are very cool!

[mazzlogic]

Thank you.

I can why collecting silicon is such a popular hobby.
Are you saying that Rockwell would print the part number on both the top and bottom of the part, or that this was an intermediary step? Any idea what the letter between the Part number and Mexico signified? (A on the Processors and F on the Ram)

I see the pins were cut away from the frame around the edges. I assume this was done so the leads could be tinned or so the parts could be tested. I would love to know more. Does anybody know where I can find more information on Rockwell's manufacturing process in the mid 70's?

[CPUShack]

The letter is most likely a revision or lot number

The early rockwell's were typically all printed back and front.

pins cut away for testing.


Good luck finding info from the 1970's its hard to come by haha

Neat chips nonetheless