On Tue, 15 Jun 1999, yasser osman wrote: > hello,anybody has suggestions for addressing external eprom by > PIC16c84. > thanks. > > > ______________________________________________________ > Get Your Private, Free Email at http://www.hotmail.com > It depends on how many eprom cells you need and how many i/o lines you have left in your application. 1) for 256 or 512 (2^8 or 2^9) eprom words, you coud use prot B and the rest of your eprom adress pins can be controlled with dip switches (bank switching) 2) take 2 74LS299 ("non-clipping" shift register) to get 16 outputs out of 3 PIC i/o lines to control a 64K (?) Eprom completely from your 16C84 I hope I could help you, for datasheets of the 74299 have a look at Friendly Regards Markus Rohe