Hi Having read all the correspondence on S-100 systems there are three possibilities. 1. Restoration 2. Reproduction or Replica 3. Reinvention Restoration In a restoration you are trying to get the system back to what it was when first made. So when possible you would use components made at the same time the system was. Can be done and is done. Does need a knowledge of older electronics and good parts sources. Reproduction or Replica Here you are attempting to make a system as close to the original design as possible but using recently manufactured versions of the original components. Where do you draw the line? Well FWIW my take on this is if it fits in the original holes and performs the same function or is the same value then the fact that it may not look exactly the same as the original is OK. Makes a nice kit project. My preference would be a Northstar Horizon. (wood effect box and all) As far as I know nobody owns the rights and the company was not sold it just folded up. Reinvention Say a copy of old S-100 system on the outside only That means the box and front panel are new but as the original. Inside,there are new electronics simulating the old system. Good route for the run the old software fans. Rod Smallwood