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AH = 58h AL = subfunction 00h get allocation strategyReturn:
AX = current strategy (see #01679) 01h set allocation strategy BL = new allocation strategy (see #01679) BH = 00h (DOS 5+)
Return:
CF clear if successful CF set on error AX = error code (01h) (see #01680)
Notes: The Set subfunction accepts any value in BL for DOS 3.x and 4.x; 2 or greater means last fit. The Get subfunction returns the last value set. Setting an allocation strategy involving high memory does not automatically link in the UMB memory chain; this must be done explicitly with AX=5803h in order to actually allocate high memory. A program which changes the allocation strategy should restore it before terminating. Toshiba MS-DOS v2.11 supports subfunctions 00h and 01h, as does the TI Professional MS-DOS v2.13. DR DOS 3.41 reportedly reverses subfunctions 00h and 01h
See Also:
AH=48h - AH=49h - AH=4Ah - INT 2F/AX=4310h"XMS" -
(Table 01679)
Values for DOS memory allocation strategy:
00h low memory first fit
01h low memory best fit
02h low memory last fit
---DOS 5+ ---
40h high memory first fit
41h high memory best fit
42h high memory last fit
80h first fit, try high then low memory
81h best fit, try high then low memory
82h last fit, try high then low memory
Category:
DOS Kernel
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Int 21h
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D
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