Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     If the function succeeds, the base address of the newly allocated
     block is AX:0000.
 
     The default allocation strategy used by MS-DOS is "first fit";
     that is, the memory block at the lowest address that is large
     enough to satisfy the request is allocated. The allocation
     strategy can be altered with Int 21h Function 58h.
 
     When a .COM program is loaded, it ordinarily already "owns" all of
     the memory in the transient program area, leaving none for dynamic
     allocation. The amount of memory initially allocated to a .EXE
     program at load time depends on the MINALLOC and MAXALLOC fields
     in the .EXE file header.
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