Int 21/AH=49h

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DOS 2+ - FREE MEMORY

AH = 49h
ES = segment of block to free

Return:
CF clear if successful CF set on error AX = error code (07h,09h) (see #01680 at AH=59h/BX=0000h)

Notes: Apparently never returns an error 07h, despite official docs; DOS 2.1+ code contains only an error 09h exit. DOS 2.1-6.0 does not coalesce adjacent free blocks when a block is freed, only when a block is allocated or resized. The code for this function is identical in DOS 2.1-6.0 except for calls to start/end a critical section in DOS 3.0+

See Also: AH=48h - AH=4Ah

Category: DOS Kernel - Int 21h - D

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