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Need help identifying this vintage IC

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DiddlyJackSquat:
Found this while I was sorting out my logic ICs and uh, I can't figure out what it is  :-//

[ Specified attachment is not available ]

Benta:
National Semiconductor. Probably with customized marking.

themadhippy:
maybe an op amp or 2

josh132:
Get one of those IC tester thingamabobs. It might tell you what is is.

DiddlyJackSquat:

--- Quote from: Benta on May 23, 2021, 08:25:15 pm ---National Semiconductor. Probably with customized marking.

--- End quote ---

That's what i thought until I tried to google the part number...  :P

natsemi 643 doesn't come up with anything nor does LM3532 make any sense
but here's their old logo

Yup that's right

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