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Addressing 8255

Murray R. Van Luyn

Hi,

I have a Philips RD2 board with a memory mapped 8255 with ports A at 8000H, B at 8001H, C at 8002H and a control port at 8003H.

How do I set up my defines so that I can just refer to these memory mapped ports as PORTA, CTRLPRT etc. in a C program?

Muz

Parents
  • 0 in reply to ImPer Westermark

    It appears that he is trying to emulate a DOS driven AT port for a DIO board using the 8051.
    Suggest that you do a inet search on DIO boards. I'm sure that you will find some old documentation with timing demonstrated.
    By the way Erik, you are not the oldest timer here. I first started on computers when John von Neumann was still alive. Of course we called him Janci. Just not digital computers for me at the time. ;-).
    Bradford

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  • 0 in reply to ImPer Westermark

    It appears that he is trying to emulate a DOS driven AT port for a DIO board using the 8051.
    Suggest that you do a inet search on DIO boards. I'm sure that you will find some old documentation with timing demonstrated.
    By the way Erik, you are not the oldest timer here. I first started on computers when John von Neumann was still alive. Of course we called him Janci. Just not digital computers for me at the time. ;-).
    Bradford

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  • 0 in reply to doubt that my ISP Al Bradford

    By the way Erik, you are not the oldest timer here
    well, since I do not know your age, and you do not know mine I can't argue the point. However, we both, evidently, have ages of experience.
    When I went to college the main electronic component was somewthing called 'tubes' or 'valves' and after collegte I was involved with making the first transistor radio made in Denmark.

    Erik