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Since a memory page is on a 256 byte boundary, the L register is ignored.
OS_Axp might be useful for applications; when properly allocating 512 bytes or more contiguous memory area. The first page is allocated with OS_Mal. Next pages are allocated with OS_Axp specifying B and H+1 (and more...).

Bugs

IX memory handle is not verified.

Related calls

OS_Bix, Bind in extended address
OS_Box, Restore bindings after OS_Bix
OS_Fc, Select fast code (fast bank switching)
OS_Mal, Allocate memory
OS_Mcl, Close memory (free memory pool)
OS_Mfr, Free (previously allocated block) memory
OS_Mgb, Get current bank binding in segment
OS_Mop, Open memory (allocate memory pool)
OS_Mpb, Set new bank binding in segment
OZ_Mgb, Get current bank binding in segment
OZ_Mpb, Set new bank binding in segment