[andrewf]

This is apparently based on the Jaguar port that id Software did in-house.

Interestingly, it seems to include a translation of Carmack's Jaguar rendering engine into C. The original was implemented in assembly for the Jaguar's proprietary RISC coprocessor. The processor's tiny instruction memory required that the renderer be split into 9 independent "phases", and that organization is preserved in the 3DO code.

http://doomwiki.org/wiki/Atari_Jaguar

http://games.slashdot.org/comments.pl?sid=4215&cid=1225529