Kres Engineering

Location: Irvine, CA

H/Z89 Hardware

EXP-700 Expansion - 7 slots, $395

DSM-240 2/4 MHz speedup modules for the H89, $79.95

Color Graphics - 192x256 pixels, 15 colors, 3D sprites, RGB and composite outputs

Music Board - 4 part harmony in stereo $125

PPT-330 Three-port parallel I/O board

H/Z89 Accessories

KMR-100 - replacement monitor ROM

RBP-200 Backplace - replacement rear panel with 20 openings $35

SCF-100 Fan - supplemental fan helps keep it cool $49.95

Power Supply - 5 volts at 10 amps - slips right in

Prototyping Cards - for left, right and ambi-bus $39.95

Joysticks - spring centering or floating $69.96

Software Products

wide selection - for business and personal use


Co-founder: Kenneth Smith

Dates: 1981 - 1997 (supporting Heath products) through 2018 (as consulting engineers)

Current Status: As of 2018, company is closing


Last Modified: Sunday, 05-Apr-2020 21:26:06 PDT

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.