7 Jul
2014
7 Jul
'14
12:50 p.m.
At 01:28 PM 7/6/2014, Mattis Lind wrote:
I could ask if that was the date code, but actually, the 7439 (TTL
number) is similar to the 8881, and I could easily beleive that DEC 8881s
were (sometimes?) selected 7439s
-tony
When repairing a TU60 drive that had faulty
DEC8881 I replaced them with
DM7439. They were $2.76 each when buying 25 pieces. The original faulty
chips were marked 7439 on the backside.
By way of confirmation, I have a bunch of (I think Signetics) 8881
chips marked 7439 on the bottom as well.