Hi Don!
Take a look at this one. I'm using it on my tabletop milling machine, (you do not need a computer, it is a stand-alone controller). Workes very well
https://www.ebay.com/itm/Digital-Dream-4-Axis-CNC-Standalone-Offline-Motion-Controlle-DDCS4-V3-1-DDCSV3-1-/273691306050
Also, take a look...