How do I use Int 25h/26h

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Peter_Vigren

How do I use Int 25h/26h

Post by Peter_Vigren »

The control block that should be used is like this:

00 dword starting sector
04 word number of sectors to read/write
06 dword pointer to buffer

Is the starting sector zero-based?
Is the number of sector to read/write zero-based or one-based? And how do I specify where the buffer is? Should the first word be the segment or should the total dword be the true offset??
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