I just bought another of these cameras and this one came with the manual. Now I know that it doesn't read 800 speed film either, great, I'm halfway through a roll of 800 in the other one I've got. To make matters worse, it's rated it at 1000ASA rather than 400ASA. Grrr.
However, it seems a simple job to get it to read Neo1600 as 1000ASA, just one black panel to scratch off.