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Re:C64 OS: A Commodore 64 OS with Modern Concepts by TickleSteve on Monday September 17, 2018 @02:34PM (#18008649)
Contiki is an RTOS and ipv6/lowpan library, intended for modern rf-capable microcontrollers with no UI.

This OS on the other hand is a desktop OS for an ancient 8-bit processor (far less capable than modern microcontrollers) and oriented around the user interface.

So... not much to compare really, they're completely different beasts.

Re:C64 OS: A Commodore 64 OS with Modern Concepts by SyneRyder on Monday September 17, 2018 @02:51PM (#18008841)
Contiki used to run on the Commodore 64 and have a desktop UI. Someone even used it to make a Twitter client for the C64, called Breadbox64.

http://www.c-64.org/pics/os/contiki1.html

https://commons.wikimedia.org/wiki/File:Contiki-C64.png

https://www.c64-wiki.com/wiki/Contiki

Re:C64 OS: A Commodore 64 OS with Modern Concepts by detaro on Monday September 17, 2018 @02:41PM (#18008725)
There is (or at least was, not sure if it is still maintained) a version of Contiki for the C64, for which as far as I know also a GUI toolkit existed.