Zenith Z-89

Zenith Z-89
Zenith Z-89 in Paris 2008
Also known asHeathkit H89
ManufacturerZenith Data Systems (ZDS)
TypePersonal computer
Release date1979; 45 years ago (1979)
Introductory priceKit version with 1 floppy drive: US$1800 in 1979 (circa equivalent to $7,600 in 2023)
Discontinued1985 (1985)
Operating systemROM monitor, HDOS, CP/M, UCSD Pascal (P-System Pascal), or MP/M
CPU2x 2.048 MHz Zilog Z80 (one for the terminal)
MemoryRAM: 16 KB – 48 KB on main board, optional 16 KB memory card (max addressable: CP/M - 64 KB, HDOS - 56 KB)
Display12" monochrome CRT, 80 x 25 character text
SoundBeeper
Connectivity3 serial, 1 Centronics parallel (optional), external diskette drive connector
RelatedHeathkit H88
Heathkit H88 computer
Heathkit H89 aka Zenith Z-89. This unit has two half-height DD diskette drives in place of the single full-height original.

The Z-89 is a personal computer introduced in 1979 by Heathkit, but produced primarily by Zenith Data Systems (ZDS) in the early 1980s. It combined an updated version of the Heathkit H8 microcomputer and H19 terminal in a new case that also provided room for a built-in floppy disk on the right side of the display. Based on the Zilog Z80 microprocessor it is capable of running CP/M as well as Heathkit's own HDOS.