PIC to ISA bus interfacing weird problem

Hi all,

I am not sure if this is the right place to post this question I am interfacing pic microcontroller (pic18f452) to FDC37c672 from SMSC. FDC37c672 has some UART and IrDA capabilities which I want to explot.

It has an ISA bus interface. I am able to read the registers from the FDC37C672. But for some reason I am unable to write to the FDC37C672 using PIC using C. So, I connected it to Computer's ISA slot and wrote code Visual C++. On PC, I am able to read and write to FDC37C672. I am not sure what is wrong with my circuit. Did anyone ever face any problem like this. I want to learn from your experience. Please feel free to suggest me. I can send you schematics of my PCB board if you are interested in.

Thanks, Kalyan

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