Where to get Legancy Ardupilot source code?

I am looking the legacy ardupilot source codes that support ATMega328p processors and the red PCB from sparkfun.
Only links I have found are for google code, and they are all dead. Surely the source is kept somewhere or by someone?
If anyone could give me a link, it would be very much appreciated.

Just to let everybody know I am well aware of the newer HW etc. I need this for personal project and to fiddle a round. Also, I was thinking that the more simple code base would be a better way to learn the ins and outs of autopilot firmware, rather than trying to understand the inner workings of the current complex AMP firmware.

The official source repository on github, https://github.com/ArduPilot/ardupilot, has code going back to 2010. I suspect that is legacy enough?

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