Old systems only ran one program at a time (basically). So boot floppy for OS into RAM, then load program floppy(s). Do the thing, save work to yet another flop

Old systems only ran one program at a time (basically). So boot floppy for OS into RAM, then load program floppy(s). Do the thing, save work to yet another floppy. Close program, maybe have to re-insert an OS floppy (ala MS-DOS). Then new floppy for next program. Only a king a 20MB RLL drive.