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.

Yep, I think it was. I do remember the VGA card being plugged into that small slot at the top.

I still have the "chipset" card because it's super interesting to have something to show that a PC chipset was actual physical chips at some point.