>On two of my 10MB ProFile controller boards,
>at location U25 I have a Zilog Z8613 with a "piggyback" ROM chip
>plugged into it. This ROM has Apple P/N 341-0286 on one of the
>ProFiles and 341-0286-A on the other. By chance are these the
>formatter ROM chips needed to perform the low-level format?
No, 341-0286 is a normal "operating" ROM. The -A being a later version.
The piggyback version of the Z8 was used when the mask programmed ROM wasn't available (ie. while waiting for delivery), not only for the LLF part.
HTH, James
James MacPhail "Think not of engineering as art, uo957_at_email.domain.hidden but of art as engineering" Sigma Seven Systems Ltd. james_at_email.domain.hidden <http://SigmaSevenSystems.com>
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