When writing Amram2 must be enabled using FBF0 *BEFORE* selecting the page with DFxx.
For fully reliable operation, use fbf0=0 then re-select rom with DFxx to ensure writing is fully disabled.
When reading as a ROM it is not necessary to use port FBF0. The normal ROM select procedure applies.
On reset or power cycle Amram2 write protect via FBF0 is disabled.
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