The Z-89 is identical to Heath Company's H-89 Kit computer, but the Z-89 came factory assembled.
From the 1982 Heath Catalog:
Z-89-81, Assembled with 48K bytes of RAM, built-in floppy disk drive for 100K bytes of data storage and three serial I/O ports, 55 lbs....... 2895.00
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If you have any question or comments, or if you have any old Heathkit equipment or software available, please contact me at: mark (at) garlanger (dot) com