Zilog Z86E21 OTP

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Does anyone know how to read the code in a Z86E21 ? I have one with a bad
port pin and would like to transfer the code to a new one. I have a
Needham's programmer to blast but it can't read it. keeping 22 year old
stuff alive is becoming a 'challenge'.
Any help is appreciated, Zilog couldn't help and I really don't like the
task of cutting new code on a new micro to replace the 21, but is is a
serious option.
My web news server doesn't have a 'zilog' group either !


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