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Symbos also run on 128k only that symbos is a complete operating system with GUI and not only a kernel like prex is now

Then submit more stories about it!

Whenever I hear about these sub-micro OSs, like Contiki and MP3 and Prex and Wheels, I ponder porting them to a more modern (read: x86) architecture.

Then again, in giving them support for all the things a typical modern computer user takes for granted, I'd just wind up with a very quirky OS about the size of a typical OS, I think.

By 'modern architecture' you appear to mean 'desktop architecture'.
Modern is defined by a timeline, i.e something that is created around the same time as you are making that statement would be defined as modern.

There are many modern processors for embedded systems, PPC, MIPS, ARM etc.

"I ponder porting them to a more modern (read: x86) architecture."

Many embedded platforms are just as modern a x86 (if x86 can even be called a modern architecture).

"Many embedded platforms are just as modern a x86 (if x86 can even be called a modern architecture)."

Many thinks we're using today do we consider to be modern, allthough they're some years old. The x86 architecture - in its basics - is circa 25 years old, the base of the Internet, i. e. TCP/IP, and other networking stuff is even older. But all these old basics can be found in the results of modern development, usually in its original representations. It's just because Intel et al. have tweaked a steam powered locomotive to run at 500 mph which we consider to be fast. :-)

Modern as in designed in 1978?

Except the architecture in modern x86 CPU's have basically nothing in common with those designed in 1978.

<flamebait>Ugh, except that the architecture in modern x86 CPUs is just as limited as that which was around in 1978.</flamebait>

Sorry, it's just me having problems adjusting to the fact that a (bad) 8-bit architecture ended up as a (worse) 64-bit architecture.