can someone tell me what arm chip is pin compatible with my AT80C2051.
found a supplier more AT80C2051 at very good (sic) price
Maybe a good short-term answer - provided these are genuine, full-spec, new & unused parts.
But, in the long-term, you just postpone the problem.
And, if the provenance of these devices is in any way less than certain, your problems may be just about to begin...