While the H11 was popular with hard-core hobbyists, Heath engineers realized that DEC's low-end PDP microprocessors would not be able to get Heath up the road to more powerful systems at an affordable price. Heath/Zenith then designed a dual Intel 8085/8088-based system dubbed the H100 (or Z-100, in preassembled form, sold by ZDS). The machine featured advanced (for the day) bit mapped video that allowed up to 640 x 512 pixels of 8 color graphics. The H100 was interesting in that it could run either the CP/M operating system, or their OEM version of MS-DOS named Z-DOS, which were the two leading business PC operating systems at the time. Although the machine had to be rebooted to change modes, the competing operating systems could read each other's disks.