Category: DOS extenders Flags: available only in protected mode
INT 31 - CauseWay - "RelMemDOS" - RELEASE CONVENTIONAL MEMORY BLOCK
AX = FF23h
DX = initial selector for block
Return: CF clear if successful
CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
Note: all descriptors allocated for the block are freed
SeeAlso: AX=FF21h,AX=FF22h,INT 21/AH=4Ah
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