Zenith H89 (AMI Phoenix 1)
The H89 represented an important transition in personal computing, combining terminal and computer functionality in one integrated unit, making it particularly attractive for business users of the era. The H89 was initially released by Heath Company as a kit computer for $1,695, with an assembled version (WH89) available for $2,395 (that’s CAD $10,000 in 2025). After Zenith Radio purchased Heath Company in 1979, the computer was re-branded as the Zenith Z-89
Sold as: Heathkit H89 or Zenith H89 or AMI Phoenix-1
Year: 1979
Processor: Zilog Z80 @ 2 MHz
Memory: 16KB – 64KB
ROM: Built-in boot loader/monitor (size unspecified)
Display: 12-inch monochrome CRT, 80×24 text-only display, no graphics capabilities
Storage: Built-in 102KB hard-sectored floppy drive+ external floppy drives
Operating Systems: HDOS (Heath DOS), CP/M, UCSD P-System
