For instance, you would be in paper space on a sheet, then you would enter model space within the viewport, then you would type Z or Zoom and enter 96xp to scale the drawing to 1/8' = 1'-0' in paper space. The suffix is AutoCAD nomenclature for changing the scale within a viewport. You will notice that the Viewport Scale in the charts below indicate a scale with the suffix XP. However, since these drawings get placed on sheets of paper that are much smaller, a scale factor is required so that the final drawing has a usable conversion factor. For instance, when drawing a door in CAD, the door would be 3 feet wide and 7 feet tall.
For simplicity and clarity, CAD users draw buildings at full scale.
