Note: This API call is for DOS personality only. Use Family API for portability.
Int 21H, AH=4AH
2 and higher
RESIZE MEMORY BLOCK
AH = 4Ah BX = new size in paragraphs ES = segment of block to resize
CF clear if successful CF set on error AX = error code (07h,08h,09h) (see #01680 at AH=59h/BX=0000h) BX = maximum paragraphs available for specified memory block
under DOS 2.1-6.0, if there is insufficient memory to expand the block as much as requested, the block will be made as large as possible DOS 2.1-6.0 coalesces any free blocks immediately following the block to be resized
Text based on Ralf Brown Interrupt List Release 61