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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+
Category: DOS Kernel - Int 21h - D
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