Date   : Fri, 25 Jul 2008 10:58:06 +0100
From   : Charlie.Robson@... (Charlie.Robson@...)
Subject: EEPROM writing in SW rom bank?

John Kortink <kortink@...> wrote on 25/07/2008 10:41:54:

> I gather you use a 28C<xxx>. According to a quick look in
> the datasheets it is 'write inhibit' if nOE is active, in
> contrast with most SRAMs, which are 'write' regardless of
> nOE.
> 
> Unfortunately, nOE is active for writes as well as reads
> on the model B (and Master). Only the B+ deasserts nOE
> for writes.
> 
> I think this might be the cause of your writing problem.
> You'll have to fabricate your own nOE.

Ahaa that'll be it. Thanks for looking, I appreciate it!





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