INT 2F - SMARTDRV v4.20+ - GET/SET FLUSH BEFORE PROMPT, CD-ROM SUPPORT

	AX = 4A10h
	BX = 0008h
	DL = subfunction
	    00h set
		DH = new states
		    bit 0: flush before prompt
		    bits 1-7 reserved (0)
	    01h get
		Return: DH = status flags
			    bit 0: (v4.2+) flush before prompt
			    bit 1: (v5.0+) CD-ROM caching support installed
Note:	v4.2 was an interim release to fix problems in the SMARTDRV included
	  with MS-DOS 6.00; v5.00 is included with MS-DOS 6.2