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About board addressing

Posted on 1998-06-10
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Last Modified: 2010-04-04
I want to address a data adquisition board (CIO-DIO96) on 300H (the board is addressing to 300H throught switchers) and I have tried it with pointers but it is not possible due to the PC memory mapping.
I want to know how could do it.
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Question by:JGT
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Accepted Solution

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jhun earned 200 total points
ID: 1351959
Here is a small funtions that reads from a io port:

function ReadFromPort ( adress: word): byte;
begin
   asm
     mov       dx, adress
     in            al, dx      { data from port }
   end;
end;

Because the result of a pascal function with result type is passed in al no futher action is nessecary to pass back the result. If you want to write to the port, replace the in al, dx with out dx, al

Gr. John

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