About PSP in assembly language programming

Hello, If any one could tell what actually a PSP is i.e. program segment prefix.. how it is useful in while simulating DOS copy command in assembly language???

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This is fairly well documented in

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Which is linked to by my page at the top of:

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The direct link for the PDF is:

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Fairly useful. Why are you asking, though? Hard to know what to say, otherwise.


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Jonathan Kirwan

it's the place where DOS store the command-line options.

Also you'll find two prepared FCBs there.

All this, and more, is covered in detail in Ralf Brown's Interrupt list, (google will get you to it)

Bye. Jasen

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