jtag command converter

Hello

Would anyone be able to recommend an economical JTAG command converter, either
to
USB or parellel (printer port) for use with Metrowerks Codewarrior on a 568000/E
device?
Or what is the simplest design to make ones own?
The evaluation boards from Motorola incorporate various designs on-board,
allowing both
5 V and 3,3 V levels on the printer port side and requiring two octal buffers to
achieve the
translation -- is that really needed?
Don't all current printer ports work on the same 5 V level?

Many thanks!
Robert Imhoff