Heathkit/Zenith Data Systems Computers (1977 - mid-1980s)

Heath Company was one of the key players at the beginning of the personal computer revolution. Today, most people carry vastly more computing power and storage in the form of a small phone. These early systems had processors which ran at 2 MHz, supported at most 64k of memory, and used floppy disks which supported about 100k.

In the mid 80s they started making IBM PC compatible systems, like most of the industry. They had some excellent designs/systems, but this site is focused exclusively on the pre-IBM PC computers, their software, and accessories.

Latest News


I've made some improvements to the H89 javascript emulator. And have been working on the H19 and H89 emulator in MAME. The H89 in MAME is now considered "working" due to the emulation of the Z-89-37 soft-sectored controller. For up-to-date status and the ROMs needed to run these machines, visit my mame page.


I've received several more donations of equipment, manuals, software, etc. There have been other updates to several of the pages on the site, and expect more changes to be coming soon.


I've been updating and adding to various company pages, adding more disks images and manuals. I have added a huge amount to my collection, and have a lot more updates and additions to the website to do.

Last Modified: Sunday, 25-Feb-2024 22:27:35 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.