I think I should explain more about what I would like to do... as I think my original question was misleading.
The Pokey is really just being used for simple High or Low outputs that will then be used to trigger logic that is programmed into an Arduino board... Does that mean the Pokey is a "slave"? Either way, I know it may seem weird to go about something with Mach like this, but for the specifics of my project it makes sense... trust me:) It has to do with the Arduino's capability to interact directly with a piece of 3D software that I am using.
So all I need to do is get an Mcode that can cause the Pokey to switch a output to High, then another Mcode to turn the output to Low.
these signals will be "read" by the arduino that will trigger other things (ie., relays, mosfet)
Scott, does the above information change your suggestion at all? or do I still need to pick a range? or have I managed to confuse everyone by rambling?
Any advice is welcome... this forum is awesome.