I've been having trouble with information also. I sent for info at the support page for Winbond-USA.

www.winbond-usa.com/products/support/

You could ask them. While I'm on the subject, do you know how to program the 4K loader flash eeprom? It must be like programming the 78E51B but the document for the 78E516B makes no mention of it.

Good Luck,

Buck Stein