Help Required Pls --- L297 / L298 Stepper Drive.

Dear Group,

The question I have is how

I am trying to workout the pinout of a 16 way connector.
This connector connects to a board that drive's three L297 / L298
stepper
drivers.

Could anyone explain to me the best procedure to find out what pin(s)
connect to what stepper driver and there function?

The reason I require this is due to the fact that the stepper drivers
are
driven from an internal control board and I wish to bi-pass this
board and
run them from a PC parallel port with step/dir.


16 way connector (logic)
|
- - - - |
|--------------- Stepper Drive X
|--------------- Stepper Drive Y
|--------------- Stepper Drive Z
Stepper > |
Back
Plane

TIA
Steve.