Prior to the Z-286 line Zenith made a line of PC compatibles with an 8 slot 8-bit ISA backplane design, the Z-150 desktop and Z-160 transportable. The backplane

Prior to the Z-286 line Zenith made a line of PC compatibles with an 8 slot 8-bit ISA backplane design, the Z-150 desktop and Z-160 transportable. The backplane board lacks the RTC and keyboard connection of the Z-286 backplane board and is therefore completely free of active components.