Like Unknown_K said, the g3 - for a video card to go into a 6100, you need an adaptor to turn the PDS port sideways. These adaptors are usually little more than an inch and a half high circuit board with tracks taking the PDS slot to another PDS connector at right angles to the original.I'm missing something, what's special about it?
in fact there are even g4 upgrades for the 6100I thought it was that but I didn't think they made G3 upgrades for 6100. Nubus 601@66mhz to G3 is quite a jump.