INT D4 - PC-MOS/386 v5.01 - GET CONTROL BLOCK DATA FROM SCB OR TCB              
	AH = 28h
	BX = offset into control block at which to start reading
	CX = number of bytes to read
	DX = segment/selector of control block obtained via AH=26h or AH=27h
	ES:DI -> buffer for data
Return: CF clear if successful
	CF set on error
	    AX = error code (see also #01680 at INT 21/AH=59h/BX=0000h)
		05h access denied due to an invalid segment/selector
SeeAlso: AH=26h,AH=27h,AH=29h,AH=2Ah