I needed a rare clock chip used in a 1970's Texas Instrument watch to repair a piece of vintage HP equipment. I could only find one from some Chinese vendors. But the chip swap did not repair the thing. Did I get a real or a fake chip? Only one way to find out: look inside.
I have since managed to reverse engineer the chips make them work, see here:    • LED watch chip from Texas Instruments...  
And I eventually repaired all my HP clock modules in an epic repairathon:    • HP 98035 Clock Module Repairathon  


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