Function 20 - Swap Interrupt Subroutines

Last reviewed: September 16, 1996
Article ID: Q19859

The information in this article applies to:

Microsoft Mouse Driver for MS-DOS, versions 3.x, 4.x, 5.x, 6.x, 7.x, 8.x, and 9.0

SUMMARY

The following is a description of Function 20: - Swap Interrupt Subroutines (Mouse Version 6.0). Function 20 allows you to get the address and call mask for a Mouse Function 12 subroutine or to exchange the vector and mask.

   Inputs:

         AX = 20
         BX = segment of new subroutine
         CX = new call mask
         DX = offset of new subroutine

   Outputs:

         BX = segment of old subroutine
         CX = old call mask
         DX = offset of old subroutine

For more information on mouse function subroutines, refer to the entries on Function 12. A well-coded application returns the old subroutine address (vector) and mask via this function when it terminates. This function is also useful for swapping between a set of Function 12 subroutines within an application.

KBCategory: kbhw
KBSubcategory:
Additional reference words: 7.00 7.04 7.05 8.00 8.10 8.20 9.00

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Last reviewed: September 16, 1996
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