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How can I move data between my program and the transfer buffer?

How do I access my peripheral card which is memory-mapped to an address between 640K and 1M?

How can I read or change a value of one of the variables in the BIOS data area?

How can I peek at an address whose far pointer I get from an INT 21h call?

Depending on your specific needs, you can use one of three methods:


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