I went looking for old screen capture programs. The first place I checked was simtel (https://archive.org/details/SIMTEL_0692), and found multiple copies of an EGA screen capture program from 1987, such as "CAPTURE.ARC 21504 06-11-87 Screen capture to disk file (from PC Magazine)". There was also an earlier dated file for dumping Hercules screens to Epson printers.

The sibling point about digital prepress is a relevant one too: So you have a file on your computer with the contents of a screen .. whatcha gonna do with it anyway?