Build Systems à la Carte is the canonical paper to read
Publication date: 28 February 2026
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In addition to supporting new memory allocation strategies as controlled by INT 21h/58h subfunctions 0 and 1 (get and set allocation strategy, respectively), DOS 5.0 also added new subfunctions 2 and 3. These allow the caller to query (subfunction 2) or set (subfunction 3) the UMB link.