Kres Engineering

Location: Irvine, CA

H/Z89 Hardware

EXP-700 Expansion - 7 slots, $395

Manual: EXP-700 Manual

IRM-517: Manual

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

Manual: DSM-240 Manual

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

The KMR-100 is a replacement monitor ROM for the Heathkit H89 computer that provides many additional features for any H/Z89-90 owner. Owners of KRES Engineering hardware will find commands that support their hardware.

Version: 3.A.02: ROM Image

Manual: KMR-100 Manual

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

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

Manual: SCF-100 Manual

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

PMM-100 - Manual

PMM-300 - Manual

Other docs


Co-founder: Kenneth Smith

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

Current Status: Closed

Last Modified: Sunday, 25-Feb-2024 22:31:47 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.