Text is fine. When you enter hires mode, all you get is random text on the screen. I've swapped out all of the chips with a working apple, but it is still the same. I've attached some pics. (note: the distortion you see in the pictures is just reflections. I think it was the only sunny day we've had in 3 weeks). You can see once I type hgr, the random text shows up.
I'm not sure what the apple uses to switch it to hires mode.