Alex, Richard and Cooper all work for AMD and work full time on the open source drivers. Cooper joined the open source effort recently, replacing another AMD employee who moved to the fglrx team. Richard is working on 6xx/7xx 3d support right now, while Alex and Cooper both work with older GPUs as well.
Matthias, Egbert and Luc played a key role in kicking off the open source graphics initiative as part of the long-standing partnership between AMD and Novell, and Matthias continued to work on the initial 6xx/7xx 3d engine documentation and support.
The big change (in 2006, really) was moving from the R3xx-based architecture (used for 3xx-5xx) to the unified shader architecture used for 6xx and higher. We kept the 3xx-5xx code base going much longer than normal, supporting 7 year old GPUs in our mainline driver in order to keep the code required for 5xx active and supported.
Nearly all of the R5xx GPUs were introduced in 2005, although there were some new board designs in 2006 to take advantage of newly available memory chips. I believe the X1950 Pro was the last new chip in the 5xx family, launched in Oct 2006.
The R600, RV610 and RV630 launched in May 2007.



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