Your friend who said that the plug "indicates that it must be plugged in to a 115/120 receptacle with a 15 amp or higher service" is the winner! Ideally tools with large motors like this should be plugged into a dedicated receptacle; meaning no other electrical device is on the same circuit. Whenever you see this type of receptacle installed you can be assured that it is 110v and is connected to at least a 15 amp breaker or fuse.
You can get an owners manual from Shopsmith by calling their customer service department at 1(800)762-7555. Say "Hi" to Linda from me.
Your saw is simply know as the "SawSmith Radial Arm Saw". The Mark I, II, V, and VII were lathe-based tools and have nothing in common with the SawSmith except that they were made by the same manufacture and could be used to power the same accessories. (On second thought, that's quite a bit to have in common!)
You'll also find a lot of information and comradery at the SawSmith Yahoo group located at this link: http://groups.yahoo.com/group/
One last thing. Visit www.patentplaceusa.com and search "SawSmith", and get yourself a copy of the patent for the Sawsmith. It's fascinating and reveals a number of secrets that aren't clear in the manual.
Good luck and I'll see you in the forum.