Honeywell HR20 central heating thermostat has MEGA169 inside

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New version of this radiator thermostat has ATMEGA169 inside, and there is a hacking project describing it all:
http://babelfish.yahoo.com/trans...
https://embeddedprojects.googlec...
http://carluccio.de/images/e/e1/...
http://sourceforge.net/projects/...