When I started working on Sun systems back in 1991 the first terminal I used was an old model that didn't support all the cursor controls, so my only option for

When I started working on Sun systems back in 1991 the first terminal I used was an old model that didn't support all the cursor controls, so my only option for editing was ed. I worked that way for a year, so for a long time I was more comfortable in ed than vi. Of course on most systems nowadays ed and vi are now different modes of the same editor, as the article notes.