I just found these today -- AMI s6820 Peripheral Interface Adapters with white ceramic, gold pins and gray trace -- and when they arrive, if they work I will probably use them on the clones.
UPDATE (9-DEC-2011): I tested one of these in the Obtronix clone, and it works! Looking forward to adding these to the Mimeo boards.
Friday, February 4, 2011
I ran into this chip recently, and the collector obliged to send me these hi-res images.
This "XC" 6280 PIA is an early engineering sample chip from the 20th week of 1975.
This chip is gold + ceramic. Note, no grounding strap across the top of the chip which you see in later chips.
Compare it to the chip from 1976 found on my Mimeo-1
Posted by John at 8:30 AM