RE: FLASH ROM incompatibilities with C128

From: Hoffmann-Vetter, Martin <>
Date: Wed, 5 Dec 2012 01:13:38 +0100
Message-ID: <00c201cdd27d$60cdd6e0$1b09a8c0@mhvnb10>
Hello Jim,

> I
> replace them with normal EPROM-based versions, and the problem
> disappears.  It only happens on flat C128s, and rarely.
> I am using Atmel AT49F001 with 55ns or 70ns speeds, which should be
> considerably faster than the original ROMs, and are faster than the
> EPROMs I use to replace the problem ones.

If i remember correctly, some flash have a address latch. So the timing for
this latch enable (chip select or output enable) can be wrong. If your flash
is fast enough, you can try to delay the chip select line.

Greetings Martin

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Received on 2012-12-05 01:00:15

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