Ultimeth Software

Dean Gibson from Ultimeth Software granted permission to post the software and manuals:

"Permission granted! Sincerely, Dean Gibson"

Ultimeth Software provided drivers for several different hardware items:

  • HDOS Hard-sectored driver supporting double-sided, 80-track floppy drives
  • HDOS MMS Soft-sector controller

I'm sure there were many more, but

The company is still in existence, see what they are up to on the Ultimeth Systems website.




Software Status

Manual Status

Original Price


HDOS hard-sectored driver supporting double-sided/80-track floppy disk drives





HDOS driver supporting Magnolia Microsystems 77316 Soft-sectored controller.





Last Modified: Sunday, 25-Sep-2016 20:36:42 PDT

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.