INT 21 - IBM SYSTEM 36/38 WORKSTATION EMULATION - VDI.SYS - GET ???

	AX = 4402h
	BX = handle for character device "GDMS"
	CX = number of bytes to read (>= 4)
	DS:DX -> buffer (see #01445)
Return: CF set on error
	    AX = error code (see #01680 at AH=59h/BX=0000h)
	CF clear if successful
	    AX = number of bytes read