Control Data (?) circuit boards

[Brent Hilpert]

On 2015-Sep-10, at 10:18 AM, Al Kossow wrote:
> On 9/10/15 9:23 AM, Mike Stein wrote:
>> Not very interesting
>> 
> 
> backside is all-telling.
> DD12092 is the part number. DD == "Data Display"
> the display division of CDC
> 
> they are the form factor that DD used. I picked up a 3291-B display
> controller manual from Billy Pettit yesteray, and is uses discrete
> cards in the same shape.
> 
> cans are Fairchild, circa 72/73

There are two chips there with dates codes 6816.

I suspect the date codes of the form e.g. 710, 728 would be 6710, 6728. At least in the past when I've seen 3-digit dates codes they've tended to correlate with dropping the decade-year digit.