Power Macintosh 6100
Also available under the "Performa" and "Workgroup Server" model lines. The Power Macintosh 6100 also offered the "DOS Compatible" model which featured a 486DX2/66 on an expansion card.
This model, along with the Power Macintosh 7100 and 8100, should be capable of running the Copland MacOS betas.
Available with either a 60MHz or 66MHz PowerPC 601 processor.
If the PRAM battery is dead or missing, the computer will likely not display any video upon being powered on. Without using a new battery, you can try the "double-tap" method which is pushing the power button twice quickly and it may restore video signal.
The PowerPC 601 CPU is extremely fragile on this board and simply installing the heatsink can crack the processor.