This system followed Heathkit's initial offering of two years earlier. It was available as both a kit to be assembled by the purchaser (model H89), or as an assembled and tested system (model WH89), at a $700 premium. Some of the software that came with the H89 included the HDOS Disk Operating System, Assembler, Text Editor and Microsoft BASIC. Zenith Radio bought Heathkit in 1979, but stopped making kits shortly thereafter as it became far less expensive to buy a computer already assembled.