Wasn't too bad--about 22 pounds, most of it battery.
I was playing with distributed digital control in 82/3 as a process engineer. We had one. Not the most powerful computers even then, but it was portable.
OS was same as today, is what I mostly worked with. Had a primitive spreadsheet, and BASIC that could drive seriel PCL's of the time. Could also up and download software from a DEC_10, which . And seeing I was a sub to the DOE I had ARPA.net access & it was a small world then.
Company paid full price--one must remember in 84', $3000/mo was a good wage. So $1800 was a lot of money. I bought a nice Harley Sportster in 82 for $1500.