[En-Nut-Discussion] Vintage Ethernut 1.1 documentation

[Rick Collins]

The ATmega103 and 128 are fully upward compatible.  There is even a fuse 
you can blow to make the 128 map to the same memory locations so you don't 
have to change anything in software.  But rather than go to a slightly 
better processor that is compatible, have you considered using the newer 
ARM based Ethernut?  The ARM version should not be any more expensive (at 
least not because of the processor) and will have a lot more capability.

I have been working on an evaluation chart for various ARM MCUs and I was 
surprised to find out that the Philips ARM chips have versions with 32 kB 
of Flash for $2.50 and less!  Versions with 128 kB of Flash run about $5.50 
compared to $7.50 for the ATmega128.  I think it is time for 8 bit 
processors to be relegated to microwave ovens and digital thermometers.

BTW, if you are interested in the chart I prepared, I have added it to the 
www.gnuarm.com web site.  Go to the main page and select Resources, then 
scroll down to the ARM Chips section and select "ARM device comparison 
chart".  I generated the HTML directly from Excel, so if it has a few 
glitches, blame MS, not me...  ;-)

The chart is a work in progress and I still need to add OKI and any other 
manufacturers that I have not thought of.  The target devices for this 
chart are MCUs complete with on chip Flash and RAM.  So I will not be 
including a lot of the devices that use off chip Flash.  I may do a second 
chart with the non-Flash ARM7s and a third for the ARM9s.


At 01:59 PM 2/26/2006, you wrote:
>Hi,
>
>I have an vintage 1.1 Ethernut, that one with the mega103 processor. And
>I've lost my hardware documentation. Does anyone have this old stuff?
>
>I have two questions regarding this:
>
>1. is it possible to change the processor to an mega128, inkluding faster
>crystal
>2. is there any possibility to add an memorymapped (2kB address space) addon
>board
>
>The sense in this is to exchange a Z80 CPU with the Ethernut in my DS9-table
>(www.trektech.de) which is broken. It lost its flash memory content and my
>old Eprommer also does not work anymore.
>
>So I thought adding a nut is a good idea, so I got ethernet that way and the
>old nut laying around senselessly. My first attempt doing all the stuff in
>software was a mess, both nuts (the old and a new 2.1 are much to slow for
>that).
>
>Thank you
>Thorsten
>
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