Re: [NTLK] MP2100 Internal RAM

Which begs the question, when PCBMan can we expect this new wondrous
creature?

Best Regards,

Paul Curtis
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-----Original Message-----
From: newtontalk-bounce@newtontalk.net
[mailto:newtontalk-bounce@newtontalk.net] On Behalf Of PCBman
Sent: Friday, April 21, 2006 10:19 AM
To: newtontalk@newtontalk.net
Subject: Re: [NTLK] MP2100 Internal RAM

Adam,

The chips on the DVT board are E28F016SV.

The maximum amount of addressable Flash on an unmodified Newton is 16MB
including the 4MB on the MLB.

The 4 empty positions on the ROM board are not for memory expansion but for
alternative flash chips (8 bit wide).
(4 chips give a 32 bit data bus).

The 2 populated positions on the ROM board are 16 bit wide (2 chips give a
32 bit wide data bus).

A common practice is to accomodate different chip configurations so that you
are not stuck with a single solution.

You can't use them for additional memory. It could be argued that you could
use them for a place to solder extra memory if you modify the signals but
that's another story...

You can add more RAM if you provide the extra address lines to decode the
additional memory AND tell the OS what you have done.

PCBman

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This is the NewtonTalk list - http://www.newtontalk.net/ for all inquiries
Official Newton FAQ: http://www.chuma.org/newton/faq/
WikiWikiNewt for all kinds of articles: http://tools.unna.org/wikiwikinewt/