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At <http://www.rof.net/yp/alphaone/activities/electronics/3c509b/> was an interesting webpage describing how you can connect a 3COM 3C509B Ethernet ISA card with a PIC16F877.
This page doesn't exist anymore, but luckily you can find some of it at web.archive.org
After reading this page I am trying to connect a PIC18F452 with a 3COM 3C509B Ethernet ISA card . At the moment I have something that is working quite well :-). You can test it by yourself if you like, you can reach the PIC18f452-webserver here.
You can download the schematic below :
This schematic is made with geda-gschem
Build on an experiment board :
Build on a Printed Circuit Board, more info about this PCB is available here :
You can download it here. Older versions are also available.
Note that I make use of gpasm (Reason: Mplab doesn't exist for GNU/Linux). So, if it doesn't work, you can try to assemble the files with gpasm.
I have written a little How To for the people who make use of MS\Windows. You can find it here. Note that I don't use MS\Windows myself, so I don't have much experience with it.
There also exists a Mplab-plugin.
From 16/05/2005 I have put all necessary files in a .tar.gz archive. If you are a MS\Windows-user and don't know how to extract such an archive, you can take a look at 7-zip.
Take a look at the News-section for more information about the changes made to the program.
Questions? Problems? Need help? Ask your questions at the pic3com-users mailing list.
You can find news and information about the most recent development at this WebLog.