I'm always looking for Heathkit/Zenith Data Systems computer related items to help fill-in holes. The current collection has been created with a combination of donations, purchases through ebay, craigslist, and other classic computer forums. The following list is just a sampling of some of the things I have am particularly interested in acquiring. If you have any Heathkit related items, you are considering getting rid of, please contact me, through one of the methods listed at the bottom of the page.


  • Heathkit's Electronic Analog Computer ES-400 / H-1, Heathkit EC-1 Analog Educational Computer
  • H/Z-29, Z-39, Z-49 Terminals
  • Working TMSI H-1000 system
  • Working Z-67 Drive system
  • Sigmasoft graphics board for the H89
  • Robots - Hero, Hero JR.


  • Missing HUG software
  • Software on paper tape for the H-10
  • Software on cassette
  • Missing Games from Evryware and others
  • CP/M Plus (DG), MP/M (DG)
  • Infocom Games
  • H11 Software


  • TMSI H-1000
  • Manuals for any of the software titles.


  • Early BUSS newsletters
  • Any newsletters from local HUG groups
  • Any other magazines with Heath related articles
  • (even if these are just scans, that would be helpful)

Last Modified: Sunday, 25-Feb-2024 22:50:39 PST

Contact Details

Mark Garlanger

Email: heathkit [at] garlanger [dot] com

If you email me, PLEASE check your spam filter for any responses.

Website: www.garlanger.com



This site is dedicated to preserving the history of the original Heathkit computers. They were initially release in 1977 and included the 8-bit H-8 and 16-bit H-11 systems. The H89 was released in 1979.