Asok Sankar Rudra wrote:
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2. Respected Peter Averill of Victoria TAFE University
mentioned about failure of 'his' old AT89C2051
programmer after running successfuly for 11/2 years.
He redesigned for new batch of '2051s.

I had the same problem recently when I bought some new Atmels. But in my case I found the bug in my own programming software. I had interpreted a vague description in the datasheet wrong. With old chips that didn't matter, but with the new ones it does. With the fixed software I can programme both old and new chips.

Best regards,

Mikkel C. Simonsen