INT D4 - PC-MOS/386 v5.01 - GET/SET KEYBOARD MODE                               
	AH = 1Ch
	AL = subfunction (00h enable, 01h disable, 02h get mode)
	BX = task ID (FFFFh for current task)
Return: CF clear if successful
	    CL = current keyboard state
	CF set on error
	    AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
Program: PC-MOS/386 is a multitasking/multiuser MS-DOS-compatible operating
	  system by The Software Link, Inc.
SeeAlso: AH=1Ah,AH=1Bh