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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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The low-level functions of all the grabbers define a number of equates.
These equates are used to calculate the size of various data buffers needed
to take screen snapshots (grabbers) and switch the video context. Because
these calculations vary widely among display adapters, the rationale for
many of the calculated assumptions may not be clear. Therefore, the
explanation provided in the following section is an attempt to clarify this
process.
 
 
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