The DOS compatibilty card in the 630 is quite a strange looking beast, it kind of reminds me of some of the upgrades for Amiga hardware - piggybacked on top of things and looks kind of unruly. It is however a great card, the CPU is socketable and I was rocking a 5x86-133Mhz in there for a while (Windows didn't work with it though, limitation of the BIOS with an "unknown" CPU), now a Intel Overdrive 486DX4-100 works properly in there now.