You should replace the caps anyway - these machines are old and those capacitors are reaching or beyond their end of life now. Even if they don't *look* like they are leaking, they will be or will start soon.
I recapped mine yesterday. It's a lot of caps but not too bad really. All 47uf 16v except for one 100uf 6v.
No 7100s were sold as DOS compatible machines and none of Apple's own aftermarket DOS compatibility cards targeted it. Although I believe that some of the DOS compatibility hardware is documented after-the-fact to work. (the 6100 DOS card in particular, once you work out how to make it physically fit.)been curious about basically a '7100 dos ready' label on an untested unwanted rom simm