I grew up with a Commodore 128, and it had two screen buffers---one for 40-column mode and one for 80-column mode. I remember listing some code on the 80-column

I grew up with a Commodore 128, and it had two screen buffers---one for 40-column mode and one for 80-column mode. I remember listing some code on the 80-column side of things so that I could edit it there and insert it into the code I had over on the 40-column side. I felt clever that day.