Environmental Control Systems

Location: Houston, TX

The PC-12 and PC-89 provides the expansion and interface capability which was previously unavailable for Heath computers. The popular 8255A Programmable Peripheral Interface (PPI) chips are utilized to provide plug-in connection for a multitude of peripheral devices such as voice and music synthesizers, printers and plotters, control and data acquisition equipment, etc., all without jeopardizing the integrity of the computer system. The perpetual clock/calendar maintains an absolute time and date reference without system power applied. Extensive documentation and support disk software is included. There has never been a better method of extending the capabilities of your computer system.

H-8 Hardware

PC-12 Clock/Calendar & 12 port parallel I/O board

H/Z89 Hardware

PC-89 Clock/Calendar & 9 port parallel I/O board

Current Status: Assuming closed


Last Modified: Sunday, 25-Feb-2024 22:30:19 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.