INT 21,44,0 / IOCTL,0 - Get Device Information

	AH = 44h
	AL = 00
	BX = handle (must be an opened device)


	on return
	AX = error code if CF set  (see DOS ERROR CODES)
	DX = device information  (see tables below)


	│F│E│D│C│B│A-8│7│6│5-0│  DX  Block Device Information
	 │ │ │ │ │  │  │ │  └───── drive number (0=A:,1=B:)
	 │ │ │ │ │  │  │ └─────── 0 = file has been written
	 │ │ │ │ │  │  └──────── 0 = disk file; 1 = character device
	 │ │ │ │ │  └────────── reserved, must be zero
	 │ │ │ │ └──────────── 1 = media not removable
	 │ │ │ └───────────── 1 = network device (DOS 3.x+)
	 │ │ └────────────── 1 = reserved
	 │ └─────────────── 1 = don't update file time or date (DOS 4.x+)
	 └──────────────── 1 = file is remote (DOS 3.x+)

	│F│E│D│C│B│A-8│7│6│5│4│3│2│1│0│  DX  Character Device Information
	 │ │ │ │ │  │  │ │ │ │ │ │ │ └──── 1 = standard input device
	 │ │ │ │ │  │  │ │ │ │ │ │ └──── 1 = standard output device
	 │ │ │ │ │  │  │ │ │ │ │ └──── 1 = NUL device
	 │ │ │ │ │  │  │ │ │ │ └──── 1 = clock device
	 │ │ │ │ │  │  │ │ │ └──── uses DOS INT 29 for fast character output
	 │ │ │ │ │  │  │ │ └──── 1 = binary mode, 0 = translated
	 │ │ │ │ │  │  │ └──── 0 = end of file on input
	 │ │ │ │ │  │  └──── 1 = character device, 0 if disk file
	 │ │ │ │ │  └───── reserved
	 │ │ │ │ └────── 1 = media not removable
	 │ │ │ └────── 1 = network device (DOS 3.x+)
	 │ │ └────── reserved
	 │ └────── 1 = supports IOCTL, via functions 2 & 3
	 └────── reserved


	- BIT 7 of register DX can be used to detect if STDIN/STDOUT is
	  redirected to/from disk; if a call to this function has DX BIT 7
	  set it's not redirected from/to disk; if it's clear then it is
	  redirected to/from disk
	- BIT B of register DX can be used to determine if a drive is
	  removable.