Here are some user manuals in German and Japan.
Update : Toki, from Russia, tell us in comments that his english version is available on Harald’s website http://sharp-pc-1600.de
Don’t forget my link page in the menu, there are some friend’s websites.
Hello
Here is also English PC-1600 User Manual : I sent them to Harald and he posted on his site
http://www.sharp-pc-1600.de/PDF/pc1600_Eng.pdf
Toki
Thank you very much Toki !
Nice to have a comment from your country.
Harald’s website is in the links menu 😉