I used to 'work from home' on and off in 1976 with a portable teletype. Two rubber cups would take a telephone handset. The keyboard and a roll of paper were my working environment. The very slow line speed was all the printer could keep up with.
I wrote a bit if code on an Apple ][ (and a Commodore PET and C64) but I never took my computing device out for a picnic. Closest I came was bringing my HP 11C with me everywhere.