Joyce,
Your 201 was originally a cabinet machine. The wiring for the controller coming out of the back of the cord block on the machine is the telling detail.
The wiring for an original portable would use this wire set:
{
http://www.shop.sew-classic.com/Cord...ers-SCE123.htm }
And it's not too hard to convert it. All you need to do is make sure the motor and light wires are in the correct place at the back of the cord block.
To rewire it the way it is now use these wires:
Cord block to wall socket:
{
http://www.shop.sew-classic.com/Cord...ORE-SCE122.htm }
Cord block to foot or knee controller:
{
http://www.shop.sew-classic.com/Cord...rol-SCE510.htm }
Hope this helps a bit.
Joe