My first exposure was with the IBM 736 Fastdraft system in 1984.
The system purchased by the company I worked for at the time came with two workstations (see picture), a plotter (carousel pens) and the CPU (the refrigerator sized box in the background)
This system cost $134,000.00
The display had a fixed ‘function’ menu on the right hand side
and all drawing was done with a light pen.
‘Points’ were the base, two of which would create a line, which in turn could be used to create shapes.
Groups of shapes could be made into ‘Patterns’ and patterns could be made into ‘Views’
Circles where a thing unto themselves. Dimensions functioned like Autocad™, .. pick 1st point, then second and then position dimension line, .. and of course text was just text.
The plotter would move the paper back and forth perpendicular to the back and forth run of the pen.
We saved our drawings on 8” +- floppy discs (flexible floppy) that could hold 512Kb each