Centroid CNC, developers of retrofit hardware and software for the CNC world has added a webpage for those interested in installing a control upgrade on ShopBot branded CNC machines. A perfect fit for budget minded users looking to replace existing aging controllers with up to date more modern components and communication methods, the Centroid Acorn controller is $299. Complete plug and play replacement controllers start at $1795 including a CNC-PC.
For more info look here: http://www.centroidcnc.com/ and click on: "CNC RETROFITS"
A side by side comparison at same cutting and rapid speeds in this video: https://youtu.be/ZXWOoKvPytc
More videos here: https://www.youtube.com/user/Islaww1/videos
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