en:docs:dos:api:int21:48

Note: This API call is for DOS personality only. Use Family API for portability.

2018/09/07 07:04 · prokushev

Int 21H, AH=48H

Version

2 and higher

Brief

ALLOCATE MEMORYY

Family API

Input

AH = 48h
BX = number of paragraphs to allocate

Return

CF clear if successful
  AX = segment of allocated block
CF set on error
  AX = error code (07h,08h) (see #01680 at AH=59h/BX=0000h)
  BX = size of largest available block

Macro

INCLUDE DOS.INC
 
ALLOCATE_MEMORY bytes

Notes

DOS 2.1-6.0 coalesces free blocks while scanning for a block to allocate

.COM programs are initially allocated the largest available memory block, and should free some memory with AH=49h before attempting any allocations

under the FlashTek X-32 DOS extender, EBX contains a protected-mode near pointer to the allocated block on a successful return

See also

Note


en/docs/dos/api/int21/48.txt · Last modified: 2021/08/14 10:46 by prokushev