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If you use an AT you can use Function 83h of Interrupt 15h.<br />
This function sets a flag at Bit number 7 after a period of time.<br />
AH:= 83h<br />
ES:= Segment Adress of the flag.<br />
BX:= Offset Adress of the flag.<br />
CX:= High Word of Microseconds you want<br />
DX:= Low Word of Microseconds you want.<br />
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Or if you want to wait for some microseconds use function 86h of the same interrupt.<br />
AH:=86h<br />
CX:= High word of microseconds to wait for.<br />
DX:= Low Word of microseconds to wait for.<br />
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If you use an AT you can use Function 83h of Interrupt 15h.
This function sets a flag at Bit number 7 after a period of time.
AH:= 83h
ES:= Segment Adress of the flag.
BX:= Offset Adress of the flag.
CX:= High Word of Microseconds you want
DX:= Low Word of Microseconds you want.

Or if you want to wait for some microseconds use function 86h of the same interrupt.
AH:=86h
CX:= High word of microseconds to wait for.
DX:= Low Word of microseconds to wait for.





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I am trying to read data from the parallel port at precise intervals (The fastest needed interval is 43 microseconds)<br />
There are also a few steps which need to be done after reading the data. &nbsp;To do this I beleive I need a very accurate timer, and the standard timer on the PC is only accurate to 54 miliseconds. &nbsp;We have tried reading data from the 8253 external timer, but have not had much luck with this. &nbsp;Does anyone have any ideas?
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I am trying to read data from the parallel port at precise intervals (The fastest needed interval is 43 microseconds)
There are also a few steps which need to be done after reading the data.  To do this I beleive I need a very accurate timer, and the standard timer on the PC is only accurate to 54 miliseconds.  We have tried reading data from the 8253 external timer, but have not had much luck with this.  Does anyone have any ideas?

C Language question

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.