Lots of good ideas, thanks everybody.
This mainly came about when a friend asked if I could transfer a specialty cassette tape they have to a CD and I got to thinking that if I could figure it out I would do the same for some of my old cassette tapes that I have not been able to find a CD for.
The simplest method might be one of the CD recorders Phil mentioned. Then just rip the CD into the computer.
I think I will have to experiment some no matter what so the little $30 Behringer unit would be the least expensive way to start.
At $200 -$300, the CD recorders and 24bit sound cards that can accept analog inputs would be the next step up. A CD recorder would be easier to use since there is no software to learn.
Either way, I have some ideas I can work with.
Thanks for all the suggestions,
Mike