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回复 1# Rom1

Please try to change Pulse Delay time  from 50us to 200us.
   

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2021-5-8 08:14

or change VDD write: 6.25V->5.5V testing

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回复 4# Rom1

The production date of this 27C series chip is relatively early, and the original factory seems to have stopped production, which may be related to the internal charging circuit of the chip during programming.