Re: Which company is MFR90073? (Manufacturer of TTL chips in 1981)...

Marko wrote:
https://www.bpn.gov/bincs/begin_search.asp
90073 is a CAGE code for CMC, probably a mfr or dist. I don't recognize it
anyhow.
Thanks for this hint. I wrote an email to them (custom chips dept) but
did not get an answer so far. Let's give them some more time...

https://www.webflis.dlis.dla.mil/WEBFLIS/pub/pub_search.aspx?niin= this
is the military database. 339-446 doesn't give any results.
Yes I knew the webflis search before and tried the part numbers
there. This black one 339-446 is used in a core memory driver near to
the
transistors driving the hinhibit lines. So I'd guess these beeing
either transistor arrays, diode arrays or resistor arrays. Using a
multimeter and doing some measurements makes the rersistors quite
unlikely.

Erik.
.

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