Hi Nance, Well if anyone has an Altair that preceded the H8 by maybe a year. The H8 was by Heathkit. It was the most elaborate and difficult electronics kit they ever made. It is a testament to their manuals that I was able to build it even though I had never touched a soldering iron in my life and knew squat about electronics. Heathkit went on to design several more computers and eventually spun off into Zentith Data Systems. Zenith later became a premier manufacturer of laptop computers but somehow managed to blow it. You hardly see their stuff anymore and I'm not even sure they are still in the business. Strictly speaking I don't have this machine anymore. I still own it but it is on permanent loan to a local museum. Still works as far as I know.