Zenith Data Systems Z89 - Heatkit H-88
Photo 1: Arthur G Korwin Piotrowski, CC BY-SA 4.0, via Wikimedia Commons (Heathkit computer H88.JPG) Photo 2: Delsener, CC BY 3.0, via Wikimedia Commons (ZenithZ89 delsener.jpg)
Personal computer, 1979, Zenith Data Systems. The Z-89 is the assembled version of the Heathkit H-89, an all-in-one computer that combined the H-19 terminal with a Z80 computer board and a 5.25" floppy drive in a single case with a 12" screen. The H-88 was the cheaper cassette-based version without the floppy drive, which could later be upgraded. Two Z80 processors are used, one for the terminal and one for the computer, and the machine runs Heath's HDOS or CP/M. It was sold both as a kit and assembled by Zenith after it bought Heath's computer business.
| Years | 1979 to 1983 |
|---|---|
| Processors | 2 x Zilog Z80 at 2.048 MHz (computer and terminal) |
| RAM | 16 to 48 KB on the main board, 64 KB with the memory card |
| Display | 12" monochrome CRT, 80 x 25 characters |
| Storage | built-in 5.25" floppy drive of 100 KB (Z-89); cassette (H-88); external drives |
| Operating system | HDOS, CP/M, UCSD p-System |
| Ports | 3 serial RS-232 through the interface card |
| Price (1979) | US$1,800 as a kit |
Documentation
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