A long overdue confession:
The upper/lowercase font in the Hi-Res Character Generator routine for the Apple II (Contributed Software No. 3) came from the character generator chip of a Commodore PET, which was just a 2716-format ROM. The Apple II had an empty $D000-$D7FF socket that was pin-compatible. I pulled the chip from the PET, plugged it into the Apple II, wrote it to a disk file, and voila.