Rob, Thanks for your help.  Connections 3 and 4 from BS1-IC to the block at the base of the circuit diagram are referred to as the "transmission path to a PC parallel port".  On an Uno, I presume this is handled through the USP connection?

Rob, I've attached a pdf of the circuit diagram.  It should be fairly self explanatory with the caption provided.  I'd like to substitute an Arduino Uno for the BS1-IC shown in the diagram.  Let me know what you think.

I have a circuit diagram for a programmable device for versatile current delivery, which utilizes a Basic Stamp I (BS1-IC, Parallax), and I would like to substitute an Arduino Uno for this project.  Is there a simple minded diagram that would allow me to translate the connections made to the BS1 to the Uno (i.e., power in (+) on the BS1 is terminal 1, on the Uno you would wire to terminal ?)?  Any references would be appreciated.