INT 13 - HARD DISK - PSIBM PS/2, any model/1 and newer PS/2IBM PS/2, any model - SET MULTIPLE MODE
	AH = 24h
	AL = number of sectors per block (2,4,8,16)
	DL = drive number (80h,81h)
Return: CF clear if successful
	CF set onerror
	AH = status (see #00234 at AH=01h)
Desc:	specify how many sectors the controller should transfer as a group
	  between operation-complete interrupts when using the Read Multiple
	  and Write Multiple functions (AH=21h,AH=22h)
Notes:	set the number of sectors to 0 to disable multiple-transfer mode
	the maximum value for the block size depends on the fixed disk
	  drive type.  The value is stored in byte 15h of the fixed disk
	  drive parameter table that is created by POSTsee Power-On Self-Test.
	the byte at address 0040h:0074h is set to status of operation.
SeeAlso: AH=21h"PSIBM PS/2, any model/1",AH=22h"PSIBM PS/2, any model/1",AH=23h"PSIBM PS/2, any model/1",AH=25h"PSIBM PS/2, any model/1"