There is a significant difference between some of the 101 machines. I've got the one where the "foot control" is built into the machine and it uses a special knee control built into the cabinet. Pretty neat machine.
You can find manuals on eBay pretty often, but do watch to get the correct one, sometimes it's little things that have changed, like the style of light, and then it's not a big deal unless you want to get the exactly correct manual for the machine.