PDP or HP-UX? Although when I was using PDPs it was all VMS. The computer centre had 40 of the machines being used by a lot of people so it was all time-slicing (We had our own Vaxstation talking to a very early Hardware-In-The-Loop machine that was sufficiently aged so as to have wirewrapped connections and worked in fixed point making programming models a smidge challenging).
The HP-UX was single station running Lotus (car manufacturer rather than spreadsheet company) Analysis and TMS32020 compiler software.
Either I started early or I'm ancient. I'm hoping it's the former... For those who use CAD I started out in 1988 with AutoCAD R2.
<Royal Navy>Pull up a bollard and give us a dit </Royal Navy>
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