At 09:04 PM 10/8/97 -0700, you wrote:
>Hi,
>
>        Did someone have experience how to write and read a information
>at 8000H external position memory! Using the PIC17c42 assembly code?

yes, if you like 68hc11 instruction(macro), you can download the code from
my homepage.
I use that for accessing RAM, but for IO I've built IO extender (because
this chip is just too fast for peripheral). Don't forget to download
schematics.
goodluck
www.poboxes.com/f
f