The spotlight section provides a more detailed description, pictures, and information about a specific item in my collection. I'll try to update this regularly, but I'm not quite sure what the frequency will be. I will be covering a wide range of items, including hardware, software, manuals,  and magazines. 

11/18/2013 An H89 All-in-One computer with the TMSI H-1000 replacementt CPU board, and a bunch of push buttons


An H-89 with it's CPU board replaced by TMSI's H-1000 board showed up on ebay. They wanted $500 or best offer. After letting stay on ebay for more than a month, I offered $200, and it was accepted.

Details and pictures of the H89 with H-1000.

Past Spotlights

10/20/2012 - Heavily Modified H89 All-In-One Computer System

A very interesting H89 showed up on ebay, with two unique disk controllers, a unique memory board, a modified power supply, and the Kres backplate. The system did not power-up, but even though I already have several H89s, due to the unique boards, I ended up buying it for $200, including shipping.

Full details of the repair and restoration of this H89.

Future Plans

  • H89 with DG Super-89 and a Cleveland Codonics Graphics card.
  • H89 with MMS 128k RAM board running CP/M Plus.
  • H89 with MMS soft-sectored controller + a bunch of extra unique items.
  • H19 with Northwest Digital Graphics card.

Last Modified: Sunday, 25-Feb-2024 22:50:10 PST

Contact Details

Mark Garlanger

Email: heathkit [at] garlanger [dot] com

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




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.