I did Computer Science at Edinburgh in the early '80s. While there were VDUs around, there weren't enough - especially at assignment crunch time. Thus sometimes

I did Computer Science at Edinburgh in the early '80s. While there were VDUs around, there weren't enough - especially at assignment crunch time. Thus sometimes the only terminal available might be a teletype printer. So Ed was the only option! While not appropriate for major edits, it could allow you to complete some final tweaks...