!*** MODULE $IODEF ***
!DEC$ OPTIONS/ALIGN=(RECORDS=PACKED,COMMONS=PACKED)/NOWARN
 ! +
 !  I/O FUNCTION CODE DEFINITIONS
 ! -
 ! 
 !  *** START PHYSICAL I/O FUNCTION CODES ***
 ! 
	PARAMETER IO$_NOP = '00000000'X		 ! NO OPERATION 
	PARAMETER IO$_UNLOAD = '00000001'X	 ! UNLOAD DRIVE 
	PARAMETER IO$_LOADMCODE = '00000001'X	 ! LOAD MICROCODE 
	PARAMETER IO$_START_BUS = '00000001'X	 ! START LAVC BUS
	PARAMETER IO$_SEEK = '00000002'X	 ! SEEK CYLINDER 
	PARAMETER IO$_SPACEFILE = '00000002'X	 ! SPACE FILES 
	PARAMETER IO$_STARTMPROC = '00000002'X	 ! START MICROPROCESSOR 
	PARAMETER IO$_STOP_BUS = '00000002'X	 ! STOP LAVC BUS
	PARAMETER IO$_RECAL = '00000003'X	 ! RECALIBRATE DRIVE 
	PARAMETER IO$_DUPLEX = '00000003'X	 ! ENTER DUPLEX MODE
	PARAMETER IO$_STOP = '00000003'X	 ! STOP 
	PARAMETER IO$_DEF_COMP = '00000003'X	 ! DEFINE NETWORK COMPONENT
	PARAMETER IO$_DRVCLR = '00000004'X	 ! DRIVE CLEAR 
	PARAMETER IO$_INITIALIZE = '00000004'X	 ! INITIALIZE 
	PARAMETER IO$_MIMIC = '00000004'X	 ! ENTER MIMIC MODE
	PARAMETER IO$_DEF_COMP_LIST = '00000004'X  ! DEFINE NETWORK COMPONENT LIST
	PARAMETER IO$_FLUSH_ERROR = '00000004'X	 ! FLUSH SCSI ERRORS
	PARAMETER IO$_RELEASE = '00000005'X	 ! RELEASE PORT 
	PARAMETER IO$_SETCLOCKP = '00000005'X	 ! SET CLOCK (PHYSICAL) 
	PARAMETER IO$_START_ANALYSIS = '00000005'X  ! START LAVC FAILURE ANALYSIS
	PARAMETER IO$_BIND = '00000005'X	 ! BIND UNITS INTO A STORAGE POOL
	PARAMETER IO$_PATH_VERIFY = '00000005'X	 ! VERIFY PATH TO DEVICE 
	PARAMETER IO$_OFFSET = '00000006'X	 ! OFFSET READ HEADS 
	PARAMETER IO$_ERASETAPE = '00000006'X	 ! ERASE TAPE 
	PARAMETER IO$_STARTDATAP = '00000006'X	 ! START DATA TRANSFER (PHYSICAL) 
	PARAMETER IO$_STOP_ANALYSIS = '00000006'X  ! STOP LAVC FAILURE ANALYSIS
	PARAMETER IO$_UNBIND = '00000006'X	 ! REMOVE UNITS FROM A STORAGE POOL
	PARAMETER IO$_RETCENTER = '00000007'X	 ! RETURN TO CENTERLINE 
	PARAMETER IO$_QSTOP = '00000007'X	 ! QUEUE STOP REQUEST 
	PARAMETER IO$_START_MONITOR = '00000007'X  ! START LAVC CHANNEL MONITOR.
	PARAMETER IO$_CREDISK = '00000007'X	 ! CREATE A DISK IN A STORAGE POOL
	PARAMETER IO$_LOCAL_DRAIN = '00000007'X	 ! DRAIN LOCAL IO
	PARAMETER IO$_PACKACK = '00000008'X	 ! PACK ACKNOWLEDGE 
	PARAMETER IO$_STOP_MONITOR = '00000008'X  ! STOP LAVC CHANNEL MONITOR.
	PARAMETER IO$_SEARCH = '00000009'X	 ! SEARCH FOR SECTOR 
	PARAMETER IO$_SPACERECORD = '00000009'X	 ! SPACE RECORDS 
	PARAMETER IO$_READRCT = '00000009'X	 ! READ REPLACEMENT & CACHING TABLE
	PARAMETER IO$_REMDISK = '00000009'X	 ! REMOVE A DISK FROM A STORAGE POOL
	PARAMETER IO$_WRITECHECK = '0000000A'X	 ! WRITE CHECK DATA 
	PARAMETER IO$_EXPORT = '0000000A'X	 ! EXPORT A DISK FROM A STORAGE POOL
	PARAMETER IO$_WRITEPBLK = '0000000B'X	 ! WRITE PHYSICAL BLOCK 
	PARAMETER IO$_READPBLK = '0000000C'X	 ! READ PHYSICAL BLOCK 
	PARAMETER IO$_WRITEHEAD = '0000000D'X	 ! WRITE HEADER AND DATA 
	PARAMETER IO$_RDSTATS = '0000000D'X	 ! READ STATISTICS 
	PARAMETER IO$_CRESHAD = '0000000D'X	 ! CREATE A SHADOW SET
	PARAMETER IO$_READHEAD = '0000000E'X	 ! READ HEADER AND DATA 
	PARAMETER IO$_ADDSHAD = '0000000E'X	 ! ADD MEMBER TO SHADOW SET
	PARAMETER IO$_WRITETRACKD = '0000000F'X	 ! WRITE TRACK DATA 
	PARAMETER IO$_COPYSHAD = '0000000F'X	 ! PERFORM SHADOW SET COPY OPERATIONS
	PARAMETER IO$_READTRACKD = '00000010'X	 ! READ TRACK DATA 
	PARAMETER IO$_REMSHAD = '00000010'X	 ! REMOVE MEMBER FROM SHADOW SET
	PARAMETER IO$_AVAILABLE = '00000011'X	 ! AVAILABLE (DISK AND TAPE CLASS) 
	PARAMETER IO$_SETPRFPATH = '00000012'X	 ! SET PREFERRED PATH
	PARAMETER IO$_DISPLAY = '00000013'X	 ! DISPLAY VOLUME LABEL
	PARAMETER IO$_REMSHADMBR = '00000014'X	 ! REMOVE MEMBER FROM SHADOW SET
	PARAMETER IO$_DSE = '00000015'X		 ! DATA SECURITY ERASE (AND REWIND) 
	PARAMETER IO$_REREADN = '00000016'X	 ! REREAD NEXT 
	PARAMETER IO$_DISK_COPY_DATA = '00000016'X  ! DISK_COPY_DATA
	PARAMETER IO$_MOUNTSHAD = '00000017'X	 ! CREATE A SHADOW SET
	PARAMETER IO$_REREADP = '00000017'X	 ! REREAD PREVIOUS 
	PARAMETER IO$_WHM = '00000017'X		 ! WRITE HISTORY MANAGEMENT
	PARAMETER IO$_AS_SETCHAR = '00000017'X	 ! ASIAN SET CHARACTERISTICS
	PARAMETER IO$_WRITERET = '00000018'X	 ! WRITE RETRY 
	PARAMETER IO$_WRITECHECKH = '00000018'X	 ! WRITE CHECK HEADER AND DATA 
	PARAMETER IO$_AS_SENSECHAR = '00000018'X  ! ASIAN SENSE CHARACTERISTICS
	PARAMETER IO$_ADDSHADMBR = '00000019'X	 ! ADD MEMBER TO SHADOW SET
	PARAMETER IO$_READPRESET = '00000019'X	 ! READIN PRESET 
	PARAMETER IO$_STARTSPNDL = '00000019'X	 ! START SPINDLE 
	PARAMETER IO$_SETCHAR = '0000001A'X	 ! SET CHARACTERISTICS 
	PARAMETER IO$_SENSECHAR = '0000001B'X	 ! SENSE TAPE CHARACTERISTICS 
	PARAMETER IO$_WRITEMARK = '0000001C'X	 ! WRITE TAPE MARK 
	PARAMETER IO$_COPYMEM = '0000001C'X	 ! COPY MEMORY
	PARAMETER IO$_PSXSETCHAR = '0000001C'X	 ! POSIX SET CHARACTERISTICS
	PARAMETER IO$_WRTTMKR = '0000001D'X	 ! WRITE TAPE MARK RETRY 
	PARAMETER IO$_DIAGNOSE = '0000001D'X	 ! DIAGNOSE 
	PARAMETER IO$_SHADMV = '0000001D'X	 ! PREFORM MOUNT VER. ON SHADOW SET
	PARAMETER IO$_PSXSENSECHAR = '0000001D'X  ! POSIX SENSE CHARACTERISTICS
	PARAMETER IO$_FORMAT = '0000001E'X	 ! FORMAT 
	PARAMETER IO$_CLEAN = '0000001E'X	 ! CLEAN TAPE 
	PARAMETER IO$_UPSHAD = '0000001E'X	 ! UPDATE SHADOW SYSDEVICE
	PARAMETER IO$_PHYSICAL = '0000001F'X	 ! HIGHEST PHYSICAL I/O FUNCTION CODE 
 ! 
 !  *** START LOGICAL I/O FUNCTION CODES ***
 ! 
	PARAMETER IO$_WRITELBLK = '00000020'X	 ! WRITE LOGICAL BLOCK 
	PARAMETER IO$_READLBLK = '00000021'X	 ! READ LOGICAL BLOCK 
	PARAMETER IO$_REWINDOFF = '00000022'X	 ! REWIND AND SET OFFLINE 
	PARAMETER IO$_READRCTL = '00000022'X	 ! READ RCT SECTOR ZERO
	PARAMETER IO$_SETMODE = '00000023'X	 ! SET MODE 
	PARAMETER IO$_REWIND = '00000024'X	 ! REWIND TAPE 
	PARAMETER IO$_SKIPFILE = '00000025'X	 ! SKIP FILES 
	PARAMETER IO$_PSXSETMODE = '00000025'X	 ! POSIX SET MODE
	PARAMETER IO$_SKIPRECORD = '00000026'X	 ! SKIP RECORDS 
	PARAMETER IO$_PSXSENSEMODE = '00000026'X  ! POSIX SENSE MODE
	PARAMETER IO$_SENSEMODE = '00000027'X	 ! SENSE TAPE MODE 
	PARAMETER IO$_WRITEOF = '00000028'X	 ! WRITE END OF FILE 
	PARAMETER IO$_TTY_PORT_BUFIO = '00000028'X  ! BUFFERED I/O TERMINAL PORT FDT ROUTINE
	PARAMETER IO$_TTY_PORT = '00000029'X	 ! TERMINAL PORT FDT ROUTINE
	PARAMETER IO$_FREECAP = '00000029'X	 ! RETURN FREE CAPACITY
	PARAMETER IO$_FLUSH = '0000002A'X	 ! FLUSH CONTROLLER CACHE
	PARAMETER IO$_AS_SETMODE = '0000002A'X	 ! ASIAN SET MODE
	PARAMETER IO$_READLCHUNK = '0000002B'X	 ! READ LARGE LOGICAL BLOCK
	PARAMETER IO$_AS_SENSEMODE = '0000002B'X  ! ASIAN SENSE MODE
	PARAMETER IO$_WRITELCHUNK = '0000002C'X	 ! WRITE LARGE LOGICAL BLOCK
	PARAMETER IO$_LOGICAL = '0000002F'X	 ! HIGHEST LOGICAL I/O FUNCTION CODE 
 ! 
 !  *** START VIRTUAL I/O FUNCTION CODES
 ! 
 !  NOTE: 
 !  Virtual IO operations to a non-file oriented device require that the process
 !  has READ access priviledges for that device. Specificly, EXE$QIO calls
 !  EXE$CHECK_DEVICE_ACCESS for the following virtual IO function codes to
 !  verify that the the process has read access rights:
 !     READPBLK,READLBLK,READVBLK, READHEAD,READTRACKD,REREADN,REREADP,
 !     READPROMPT,TTYREADALL,TTYREADPALL
	PARAMETER IO$_WRITEVBLK = '00000030'X	 ! WRITE VIRTUAL BLOCK 
	PARAMETER IO$_READVBLK = '00000031'X	 ! READ VIRTUAL BLOCK 
	PARAMETER IO$_ACCESS = '00000032'X	 ! ACCESS FILE 
	PARAMETER IO$_PSXWRITEVBLK = '00000032'X  ! POSIX WRITE VIRTUAL
	PARAMETER IO$_CREATE = '00000033'X	 ! CREATE FILE 
	PARAMETER IO$_DEACCESS = '00000034'X	 ! DEACCESS FILE 
	PARAMETER IO$_PSXREADVBLK = '00000034'X	 ! POSIX READ VIRTUAL
	PARAMETER IO$_DELETE = '00000035'X	 ! DELETE FILE 
	PARAMETER IO$_MODIFY = '00000036'X	 ! MODIFY FILE 
	PARAMETER IO$_NETCONTROL = '00000036'X	 ! X25 NETWORK CONTROL FUNCTION 
	PARAMETER IO$_READPROMPT = '00000037'X	 ! READ TERMINAL WITH PROMPT 
	PARAMETER IO$_SETCLOCK = '00000037'X	 ! SET CLOCK 
	PARAMETER IO$_AUDIO = '00000037'X	 ! CD-ROM AUDIO
	PARAMETER IO$_ACPCONTROL = '00000038'X	 ! MISCELLANEOUS ACP CONTROL 
	PARAMETER IO$_STARTDATA = '00000038'X	 ! START DATA 
	PARAMETER IO$_IOCTLV = '00000038'X	 ! GENERIC UNIX IOCTL FUNCTIONS
	PARAMETER IO$_MANAGE = '00000038'X	 ! MANAGE DEVICE
	PARAMETER IO$_MOUNT = '00000039'X	 ! MOUNT VOLUME 
	PARAMETER IO$_TTYREADALL = '0000003A'X	 !  TERMINAL READ PASSALL 
	PARAMETER IO$_DISMOUNT = '0000003A'X	 !  F64 dismount
	PARAMETER IO$_TTYREADPALL = '0000003B'X	 !  TERM READ W/PROMPT PASSALL 
	PARAMETER IO$_USBATTR = '0000003B'X	 !  USB device attributes
	PARAMETER IO$_CONINTREAD = '0000003C'X	 !  Connect to interrupt readonly 
	PARAMETER IO$_CONINTWRITE = '0000003D'X	 !  Connect to interrupt with write 
	PARAMETER IO$_READDIR = '0000003E'X	 ! READ DIRECTORY CONTENTS
	PARAMETER IO$_VIRTUAL = '0000003F'X	 ! HIGHEST VIRTUAL I/O FUNCTION 
 ! 
 !  FUNCTION MODIFIER BIT DEFINITIONS
 ! 
	PARAMETER IO$M_FCODE = '0000003F'X
	PARAMETER IO$M_FMODIFIERS = '0000FFC0'X
	PARAMETER IO$M_INHERLOG = '00000800'X
	PARAMETER IO$M_ERASE = '00000400'X
	PARAMETER IO$M_EXFUNC = '00002000'X
	PARAMETER IO$M_DATACHECK = '00004000'X
	PARAMETER IO$M_INHRETRY = '00008000'X
	PARAMETER IO$M_SYNCSTS = '00010000'X
	PARAMETER IO$M_NOVCACHE = '00020000'X
	PARAMETER IO$M_BUFOBJ = '00040000'X
	PARAMETER IO$M_TRUSTED = '00080000'X
	PARAMETER IO$M_FILE_FLUSH = '00100000'X
	PARAMETER IO$M_BARRIER = '00200000'X
	PARAMETER IO$M_RAH_HINT = '00400000'X
	PARAMETER IO$M_INHSEEK = '00001000'X
	PARAMETER IO$M_READ_TO_EOF = '00200000'X
	PARAMETER IO$M_REVERSE = '00000040'X
	PARAMETER IO$M_NOWAIT = '00000080'X
	PARAMETER IO$M_INHEXTGAP = '00001000'X
	PARAMETER IO$M_RETENSION = '00002000'X
	PARAMETER IO$M_ALLOWFAST = '00004000'X
	PARAMETER IO$M_MT3_DENSITY = '00008000'X
	PARAMETER IO$M_MSCPMODIFS = '00000100'X
	PARAMETER IO$M_SHADOW = '00000040'X
	PARAMETER IO$M_LOCATE = '00000080'X
	PARAMETER IO$M_MSCP_FORMAT = '00000040'X
	PARAMETER IO$M_ALLHOSTS = '00000040'X
	PARAMETER IO$M_DISSOLVE = '00000080'X
	PARAMETER IO$M_NOCLEANUP = '00000100'X
	PARAMETER IO$M_SPINDOWN = '00000040'X
	PARAMETER IO$M_EST_COM_PATH = '00000040'X
	PARAMETER IO$M_LCL_SRC_UNIT = '00000080'X
	PARAMETER IO$M_RTN_COM_PATH = '00000100'X
	PARAMETER IO$M_DEALC_ALL = '00000040'X
	PARAMETER IO$M_DEALC_HRN = '00000080'X
	PARAMETER IO$M_DEALC_ENTLOC = '00000100'X
	PARAMETER IO$M_DECR_AFC = '00000200'X
	PARAMETER IO$M_READ_ALL = '00000400'X
	PARAMETER IO$M_READ_HRN = '00000800'X
	PARAMETER IO$M_BREAK_CONN = '00001000'X
	PARAMETER IO$M_STEPOVER = '00000040'X
	PARAMETER IO$M_COPYOP = '00000100'X
	PARAMETER IO$M_EXISTS = '00000040'X
	PARAMETER IO$M_CBS = '00000080'X
	PARAMETER IO$M_BOOTING = '00000100'X
	PARAMETER IO$M_REQ_MINICOPY = '00000200'X
	PARAMETER IO$M_OPT_MINICOPY = '00000400'X
	PARAMETER IO$M_NOMINICOPY = '00000800'X
	PARAMETER IO$M_EXPECT_MOUNT_DONE = '00002000'X
	PARAMETER IO$M_VUEX_FC = '00000200'X
	PARAMETER IO$M_WRITE_SCB = '00000200'X
	PARAMETER IO$M_UPD_SCBLBN = '00002000'X
	PARAMETER IO$M_FORCEPATH = '00000040'X
	PARAMETER IO$M_PREFERRED_CPU = '00000080'X
	PARAMETER IO$M_SYS_ASSIGNABLE = '00000100'X
	PARAMETER IO$M_COMMOD = '00000040'X
	PARAMETER IO$M_MOVETRACKD = '00000080'X
	PARAMETER IO$M_DIAGNOSTIC = '00000100'X
	PARAMETER IO$M_SKPSECINH = '00000200'X
	PARAMETER IO$M_DELDATA = '00000040'X
	PARAMETER IO$M_NOMRSP = '00000040'X
	PARAMETER IO$M_SWAP = '00000100'X
	PARAMETER IO$M_OPPOSITE = '00000200'X
	PARAMETER IO$M_CLSEREXCP = '00000200'X
	PARAMETER IO$M_CHUNKDIAG = '00000040'X
	PARAMETER IO$M_TBC = '00000400'X
	PARAMETER IO$M_ENAREP = '00000040'X
	PARAMETER IO$M_ACCESS = '00000040'X
	PARAMETER IO$M_CREATE = '00000080'X
	PARAMETER IO$M_DELETE = '00000100'X
	PARAMETER IO$M_MOUNT = '00000200'X
	PARAMETER IO$M_DMOUNT = '00000400'X
	PARAMETER IO$M_REMOUNT = '00000800'X
	PARAMETER IO$M_MOVEFILE = '00001000'X
	PARAMETER IO$M_RWSHELVED = '00004000'X
	PARAMETER IO$M_SETDIR = '00008000'X
	PARAMETER IO$M_BINARY = '00000040'X
	PARAMETER IO$M_PACKED = '00000080'X
	PARAMETER IO$M_NOW = '00000040'X
	PARAMETER IO$M_STREAM = '00000080'X
	PARAMETER IO$M_READERCHECK = '00000100'X
	PARAMETER IO$M_WRITERCHECK = '00000200'X
	PARAMETER IO$M_NORSWAIT = '00000400'X
	PARAMETER IO$M_MB_ROOM_NOTIFY = '00000040'X
	PARAMETER IO$M_READATTN = '00000080'X
	PARAMETER IO$M_WRTATTN = '00000100'X
	PARAMETER IO$M_SETPROT = '00000200'X
	PARAMETER IO$M_READERWAIT = '00000400'X
	PARAMETER IO$M_WRITERWAIT = '00000800'X
	PARAMETER IO$M_NOECHO = '00000040'X
	PARAMETER IO$M_TIMED = '00000080'X
	PARAMETER IO$M_CVTLOW = '00000100'X
	PARAMETER IO$M_NOFILTR = '00000200'X
	PARAMETER IO$M_DSABLMBX = '00000400'X
	PARAMETER IO$M_PURGE = '00000800'X
	PARAMETER IO$M_TRMNOECHO = '00001000'X
	PARAMETER IO$M_REFRESH = '00002000'X
	PARAMETER IO$M_ESCAPE = '00004000'X
	PARAMETER IO$M_EXTEND = '00008000'X
	PARAMETER IO$M_CANCTRLO = '00000040'X
	PARAMETER IO$M_ENABLMBX = '00000080'X
	PARAMETER IO$M_NOFORMAT = '00000100'X
	PARAMETER IO$M_BREAKTHRU = '00000200'X
	PARAMETER IO$M_NEWLINE = '00000400'X
	PARAMETER IO$M_TYPEAHDCNT = '00000040'X
	PARAMETER IO$M_MAINT = '00000040'X
	PARAMETER IO$M_CTRLYAST = '00000080'X
	PARAMETER IO$M_CTRLCAST = '00000100'X
	PARAMETER IO$M_HANGUP = '00000200'X
	PARAMETER IO$M_OUTBAND = '00000400'X
	PARAMETER IO$M_TT_CONNECT = '00000800'X
	PARAMETER IO$M_TT_DISCON = '00001000'X
	PARAMETER IO$M_TT_PROCESS = '00002000'X
	PARAMETER IO$M_BRDCST = '00004000'X
	PARAMETER IO$M_LOOP = '00000080'X
	PARAMETER IO$M_UNLOOP = '00000100'X
	PARAMETER IO$M_LINE_OFF = '00000200'X
	PARAMETER IO$M_SET_MODEM = '00000400'X
	PARAMETER IO$M_LINE_ON = '00000800'X
	PARAMETER IO$M_LOOP_EXT = '00001000'X
	PARAMETER IO$M_AUTXOF_ENA = '00002000'X
	PARAMETER IO$M_AUTXOF_DIS = '00004000'X
	PARAMETER IO$M_INCLUDE = '00000800'X
	PARAMETER IO$M_TT_ABORT = '00001000'X
	PARAMETER IO$M_POSIXINIT = '00000040'X
	PARAMETER IO$M_POSIXFLOW = '00000080'X
	PARAMETER IO$M_SET_POSIX = '00000080'X
	PARAMETER IO$M_CLEAR_POSIX = '00000100'X
	PARAMETER IO$M_SET_TERMIOS = '00000200'X
	PARAMETER IO$M_SET_PTC = '00000400'X
	PARAMETER IO$M_CLEAR_PTC = '00000800'X
	PARAMETER IO$M_FLUSH_TAB = '00001000'X
	PARAMETER IO$M_FLUSH_OUTPUT = '00002000'X
	PARAMETER IO$M_UPDATE_PTC = '00004000'X
	PARAMETER IO$M_OUT_XOFF = '00000100'X
	PARAMETER IO$M_OUT_XON = '00000200'X
	PARAMETER IO$M_IN_XOFF = '00000400'X
	PARAMETER IO$M_IN_XON = '00000800'X
	PARAMETER IO$M_O_NONBLOCK = '00000040'X
	PARAMETER IO$M_INTERRUPT = '00000040'X
	PARAMETER IO$M_MULTIPLE = '00000080'X
	PARAMETER IO$M_LOCKBUF = '00000100'X
	PARAMETER IO$M_NOBLOCK = '00000200'X
	PARAMETER IO$M_ABORT = '00000100'X
	PARAMETER IO$M_SYNCH = '00000200'X
	PARAMETER IO$M_RESPONSE = '00000040'X
	PARAMETER IO$M_STARTUP = '00000040'X
	PARAMETER IO$M_SHUTDOWN = '00000080'X
	PARAMETER IO$M_ATTNAST = '00000100'X
	PARAMETER IO$M_CTRL = '00000200'X
	PARAMETER IO$M_SET_MAC = '00000800'X
	PARAMETER IO$M_UPDATE_MAP = '00001000'X
	PARAMETER IO$M_ROUTE = '00002000'X
	PARAMETER IO$M_RD_MEM = '00000040'X
	PARAMETER IO$M_RD_MODEM = '00000080'X
	PARAMETER IO$M_RD_COUNT = '00000100'X
	PARAMETER IO$M_CLR_COUNT = '00000400'X
	PARAMETER IO$M_SENSE_MAC = '00000800'X
	PARAMETER IO$M_SHOW_MAP = '00001000'X
	PARAMETER IO$M_SHOW_ROUTE = '00002000'X
	PARAMETER IO$K_SRRUNOUT = '00000000'X	 !  Send or rcv until cnt runout 
	PARAMETER IO$K_PTPBSC = '00002000'X	 !  Point to point BSC control 
	PARAMETER IO$K_LOOPTEST = '0000E000'X	 !  Loop test 
 !  X25 driver WRITEBLK function modifier bits.
	PARAMETER IO$M_MORE = '00000040'X
	PARAMETER IO$M_QUALIFIED = '00000080'X
	PARAMETER IO$M_REDIRECT = '00000040'X
	PARAMETER IO$M_ACCEPT = '00000080'X
	PARAMETER IO$M_SETEVF = '00000040'X
	PARAMETER IO$M_WORD = '00000040'X
	PARAMETER IO$M_SETFNCT = '00000200'X
	PARAMETER IO$M_DATAPATH = '00000400'X
	PARAMETER IO$M_CYCLE = '00001000'X
	PARAMETER IO$M_RESET = '00002000'X
	PARAMETER IO$M_SETCUADR = '00000100'X
	PARAMETER IO$M_SETBSIZE = '00000200'X
	PARAMETER IO$M_SETPOOLSZ = '00000400'X
	PARAMETER IO$M_SETENQCNT = '00000800'X
	PARAMETER IO$M_CLEAR = '00001000'X
	PARAMETER IO$M_LPBEXT = '00002000'X
	PARAMETER IO$M_LPBINT = '00004000'X
	PARAMETER IO$M_READCSR = '00008000'X
	PARAMETER IO$M_NOCTSWAIT = '00000040'X
	PARAMETER IO$M_SLAVLOOP = '00000080'X
	PARAMETER IO$M_NODSRWAIT = '00000100'X
	PARAMETER IO$M_MAINTLOOP = '00000200'X
	PARAMETER IO$M_LASTBLOCK = '00000400'X
	PARAMETER IO$M_INTCLOCK = '00001000'X
	PARAMETER IO$M_LT_CONNECT = '00000040'X
	PARAMETER IO$M_LT_DISCON = '00000080'X
	PARAMETER IO$M_LT_READPORT = '00000100'X
	PARAMETER IO$M_LT_MAP_PORT = '00000200'X
	PARAMETER IO$M_LT_RATING = '00000400'X
	PARAMETER IO$M_LT_SOL_INFO = '00000800'X
	PARAMETER IO$M_LT_RCV_INFO = '00001000'X
	PARAMETER IO$M_LT_SETMODE = '00002000'X
	PARAMETER IO$M_LT_SENSEMODE = '00004000'X
	PARAMETER IO$M_LT_QUE_CHG_NOTIF = '00008000'X
	PARAMETER IO$M_LT_MAP_FILLER = '00000001'X
	PARAMETER IO$M_LT_MAP_NODNAM = '00000002'X
	PARAMETER IO$M_LT_MAP_PORNAM = '00000004'X
	PARAMETER IO$M_LT_MAP_SRVNAM = '00000008'X
	PARAMETER IO$M_LT_MAP_LNKNAM = '00000010'X
	PARAMETER IO$M_LT_MAP_NETADR = '00000020'X
	PARAMETER IO$M_FLUSH = '00000040'X
	PARAMETER IO$M_WRITE_BARRIER = '00000080'X
	PARAMETER IO$M_MKFILL1 = '00000040'X
	PARAMETER IO$M_ALLOWFAST_NEVER = '00000080'X
	PARAMETER IO$M_ALLOWFAST_PER_IO = '00000100'X
	PARAMETER IO$M_ALLOWFAST_ALWAYS = '00000200'X
	PARAMETER IO$M_ADD = '00000040'X
	PARAMETER IO$M_IDSTRING = '00000040'X
	PARAMETER IO$M_SERIALNUM = '00000080'X
	PARAMETER IO$M_BYPASS_VALID_CHK = '00000080'X
	STRUCTURE /IODEF/
	UNION
 !  Basic I/O function code/modifiers structure
	    MAP
	        PARAMETER IO$S_FCODE = 6
	        PARAMETER IO$V_FCODE = 0		 !  Function Code Field
	        PARAMETER IO$S_FMODIFIERS = 10
	        PARAMETER IO$V_FMODIFIERS = 6
	        BYTE %FILL (2)				 !  Function Modifiers Field
	    END MAP
 !  Function modifiers common to all drivers which do error logging
	    MAP
	        PARAMETER IO$S_INHERLOG = 1
	        PARAMETER IO$V_INHERLOG = 11		 !  Inhibit error logging
	    BYTE %FILL (1)
	    END MAP
 !  General disk and tape function code modifiers
	    MAP
	        PARAMETER IO$S_ERASE = 1
	        PARAMETER IO$V_ERASE = 10		 !  Erase data
	        PARAMETER IO$S_EXFUNC = 1
	        PARAMETER IO$V_EXFUNC = 13		 !  func<31:16> are valid
	        PARAMETER IO$S_DATACHECK = 1
	        PARAMETER IO$V_DATACHECK = 14		 !  Write check data after transfer
	        PARAMETER IO$S_INHRETRY = 1
	        PARAMETER IO$V_INHRETRY = 15		 !  Inhibit error retry
 !  the following are only valid if EXFUNC is set
	        PARAMETER IO$S_SYNCSTS = 1
	        PARAMETER IO$V_SYNCSTS = 16		 !  allow synchronous completion
	        PARAMETER IO$S_NOVCACHE = 1
	        PARAMETER IO$V_NOVCACHE = 17		 !  do not use VBN cache
	        PARAMETER IO$S_BUFOBJ = 1
	        PARAMETER IO$V_BUFOBJ = 18		 !  Buffer object I/O
	        PARAMETER IO$S_TRUSTED = 1
	        PARAMETER IO$V_TRUSTED = 19		 !  I/O from trusted component
	        PARAMETER IO$S_FILE_FLUSH = 1
	        PARAMETER IO$V_FILE_FLUSH = 20		 !  Flush file to disk
	        PARAMETER IO$S_BARRIER = 1
	        PARAMETER IO$V_BARRIER = 21		 !  Insert a barrier after the write
	        PARAMETER IO$S_RAH_HINT = 1
	        PARAMETER IO$V_RAH_HINT = 22		 !  Readahead hint (used by XFC)
	    BYTE %FILL (2)
	    END MAP
 !  General disk function code modifiers
	    MAP
	        PARAMETER IO$S_INHSEEK = 1
	        PARAMETER IO$V_INHSEEK = 12		 !  Inhibit implied seek on physical functions
	    BYTE %FILL (1)
	    END MAP
 !  General disk READ function code modifiers
	    MAP
 !  the following are only valid if EXFUNC is set
	        PARAMETER IO$S_READ_TO_EOF = 1
	        PARAMETER IO$V_READ_TO_EOF = 21		 !  Reserved for Internal Use only.
	    BYTE %FILL (1)
	    END MAP
 !  General tape function code modifiers
	    MAP
	        PARAMETER IO$S_REVERSE = 1
	        PARAMETER IO$V_REVERSE = 6		 !  Reverse operation
	        PARAMETER IO$S_NOWAIT = 1
	        PARAMETER IO$V_NOWAIT = 7		 !  No wait for rewind to complete
	        PARAMETER IO$S_INHEXTGAP = 1
	        PARAMETER IO$V_INHEXTGAP = 12		 !  Inhibit extended inter-record gap 
	        PARAMETER IO$S_RETENSION = 1
	        PARAMETER IO$V_RETENSION = 13		 !  Traverse the entire tape to uniformly set the tape's ten
					!  Traverse the entire tape to uniformly set the tape's tensio
 !   Applies only to IO$_REWIND/REWINDOFF functions
	        PARAMETER IO$S_ALLOWFAST = 1
	        PARAMETER IO$V_ALLOWFAST = 14		 !  Allow fast skip by filemarks when enabled
 !   Applies only to IO$_SKIPFILE/SPACEFILE functions
	        PARAMETER IO$S_MT3_DENSITY = 1
	        PARAMETER IO$V_MT3_DENSITY = 15
	        BYTE %FILL (1)				 !  Density Setmode and Sensemode for MTD enhanced tape drivers.
	    END MAP
 !  DU  & TU, disk & tape class driver transfer function modifier bits
	    MAP
	        PARAMETER IO$S_MSCPMODIFS = 1
	        PARAMETER IO$V_MSCPMODIFS = 8		 !  Use MSCP modifiers in P5
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_SHADOW = 1
	        PARAMETER IO$V_SHADOW = 6		 !  Shadowing SENSECHAR
	        PARAMETER IO$S_LOCATE = 1
	        PARAMETER IO$V_LOCATE = 7
	        BYTE %FILL (1)				 !  Shadowing Locate function
	    END MAP
	    MAP
	        PARAMETER IO$S_MSCP_FORMAT = 1
	        PARAMETER IO$V_MSCP_FORMAT = 6		 !  PACKACK media for formatting
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_ALLHOSTS = 1
	        PARAMETER IO$V_ALLHOSTS = 6		 !  Do available as for all class drivers
	        PARAMETER IO$S_DISSOLVE = 1
	        PARAMETER IO$V_DISSOLVE = 7		 !  Dissolve shadow set
	        PARAMETER IO$S_NOCLEANUP = 1
	        PARAMETER IO$V_NOCLEANUP = 8		 !  Normal shadow set cleanup not necessary
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_SPINDOWN = 1
	        PARAMETER IO$V_SPINDOWN = 6		 !  Spin down removed member
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_EST_COM_PATH = 1
	        PARAMETER IO$V_EST_COM_PATH = 6		 !  Establish Communication Path
	        PARAMETER IO$S_LCL_SRC_UNIT = 1
	        PARAMETER IO$V_LCL_SRC_UNIT = 7		 !  Local Source Unit
	        PARAMETER IO$S_RTN_COM_PATH = 1
	        PARAMETER IO$V_RTN_COM_PATH = 8		 !  Retain Communication Path
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_DEALC_ALL = 1
	        PARAMETER IO$V_DEALC_ALL = 6		 !  Deallocate All
	        PARAMETER IO$S_DEALC_HRN = 1
	        PARAMETER IO$V_DEALC_HRN = 7		 !  Deallocate by Host Reference Number
	        PARAMETER IO$S_DEALC_ENTLOC = 1
	        PARAMETER IO$V_DEALC_ENTLOC = 8		 !  Deallocate by Entry Locator
	        PARAMETER IO$S_DECR_AFC = 1
	        PARAMETER IO$V_DECR_AFC = 9		 !  Decrement Allocation Failure Count
	        PARAMETER IO$S_READ_ALL = 1
	        PARAMETER IO$V_READ_ALL = 10		 !  Read All
	        PARAMETER IO$S_READ_HRN = 1
	        PARAMETER IO$V_READ_HRN = 11		 !  Read by Host Reference Number
	        PARAMETER IO$S_BREAK_CONN = 1
	        PARAMETER IO$V_BREAK_CONN = 12		 !  Break Connection
	    BYTE %FILL (1)
	    END MAP
 !  HBS driver transfer function modifier bits
 !  Make sure that IO$V_SHADOW .ne. IO$V_LOCATE .ne. IO$V_COPYOP
	    MAP
	        PARAMETER IO$S_STEPOVER = 1
	        PARAMETER IO$V_STEPOVER = 6		 !  Stepover SCBLBN.
	        PARAMETER IO$S_COPYOP = 1
	        PARAMETER IO$V_COPYOP = 8		 !  Shad Server Cpy Operation
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_EXISTS = 1
	        PARAMETER IO$V_EXISTS = 6		 !  VU already exists.
	        PARAMETER IO$S_CBS = 1
	        PARAMETER IO$V_CBS = 7			 !  Controller based shadowing.
	        PARAMETER IO$S_BOOTING = 1
	        PARAMETER IO$V_BOOTING = 8		 !  Creshad for system disk.
	        PARAMETER IO$S_REQ_MINICOPY = 1
	        PARAMETER IO$V_REQ_MINICOPY = 9		 !  MINICOPY required
	        PARAMETER IO$S_OPT_MINICOPY = 1
	        PARAMETER IO$V_OPT_MINICOPY = 10	 !  MINICOPY optional
	        PARAMETER IO$S_NOMINICOPY = 1
	        PARAMETER IO$V_NOMINICOPY = 11		 !  NOMINICOPY
	        PARAMETER IO$S_EXPECT_MOUNT_DONE = 1
	        PARAMETER IO$V_EXPECT_MOUNT_DONE = 13	 !  All SSMs on command line sent to HBVS
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_VUEX_FC = 1
	        PARAMETER IO$V_VUEX_FC = 9		 !  Exclude Full copy members
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_WRITE_SCB = 1
	        PARAMETER IO$V_WRITE_SCB = 9		 !  Write the SCB
	        PARAMETER IO$S_UPD_SCBLBN = 1
	        PARAMETER IO$V_UPD_SCBLBN = 13		 !  Update HVBS on new location of the SCB
	    BYTE %FILL (1)
	    END MAP
 !  Function modifier bits for Set Preferred Path. 
	    MAP
 !  No modifiers set, passes in a preferred path (DUDRIVER)
	        PARAMETER IO$S_FORCEPATH = 1
	        PARAMETER IO$V_FORCEPATH = 6		 !  Make path change happen (DUDRIVER)
	        PARAMETER IO$S_PREFERRED_CPU = 1
	        PARAMETER IO$V_PREFERRED_CPU = 7	 !  Set Fast Path CPU affinity of port (port driver)
	        PARAMETER IO$S_SYS_ASSIGNABLE = 1
	        PARAMETER IO$V_SYS_ASSIGNABLE = 8	 !  system assignable port
	    BYTE %FILL (1)
	    END MAP
 !  DR driver function modifier bits.
	    MAP
	        PARAMETER IO$S_COMMOD = 1
	        PARAMETER IO$V_COMMOD = 6		 !  Diagnostic command
	        PARAMETER IO$S_MOVETRACKD = 1
	        PARAMETER IO$V_MOVETRACKD = 7		 !  Move track descriptor
	        PARAMETER IO$S_DIAGNOSTIC = 1
	        PARAMETER IO$V_DIAGNOSTIC = 8		 !  Diagnostic function
	        PARAMETER IO$S_SKPSECINH = 1
	        PARAMETER IO$V_SKPSECINH = 9		 !  Skip sector inhibit
	    BYTE %FILL (1)
	    END MAP
 !  DY driver function modifier bits.
	    MAP
	        PARAMETER IO$S_DELDATA = 1
	        PARAMETER IO$V_DELDATA = 6		 !  Write deleted data mark
	    BYTE %FILL (1)
	    END MAP
 !  DD driver (TU58) function modifier bits.
	    MAP
	        PARAMETER IO$S_NOMRSP = 1
	        PARAMETER IO$V_NOMRSP = 6		 !  Do not use MRSP for this operation
	    BYTE %FILL (1)
	    END MAP
 !  Magnetic tape I/O function modifier bits for the TS11.
	    MAP
	        PARAMETER IO$S_SWAP = 1
	        PARAMETER IO$V_SWAP = 8			 !  Swap byte (TS11)
	        PARAMETER IO$S_OPPOSITE = 1
	        PARAMETER IO$V_OPPOSITE = 9		 !  Opposite bit for rereads (TS11)
	    BYTE %FILL (1)
	    END MAP
 !  TU driver function modifier bits
	    MAP
	        PARAMETER IO$S_CLSEREXCP = 1
	        PARAMETER IO$V_CLSEREXCP = 9		 !  Clear serious exception condition
	    BYTE %FILL (1)
	    END MAP
 !  Tape class driver segmented and large transfer modifier bits
	    MAP
	        PARAMETER IO$S_CHUNKDIAG = 1
	        PARAMETER IO$V_CHUNKDIAG = 6		 !  Allow diagnostic buffers
	        PARAMETER IO$S_TBC = 1
	        PARAMETER IO$V_TBC = 10			 !  To be continued modifier
	    BYTE %FILL (1)
	    END MAP
 !  TUDRIVER SETMODE function modifier bits.
	    MAP
	        PARAMETER IO$S_ENAREP = 1
	        PARAMETER IO$V_ENAREP = 6		 !  Enable media quality
	    BYTE %FILL (1)
	    END MAP
 !  reporting.
 !  ACP function modifier bits.
	    MAP
	        PARAMETER IO$S_ACCESS = 1
	        PARAMETER IO$V_ACCESS = 6		 !  Access file
	        PARAMETER IO$S_CREATE = 1
	        PARAMETER IO$V_CREATE = 7		 !  Create file
	        PARAMETER IO$S_DELETE = 1
	        PARAMETER IO$V_DELETE = 8		 !  Delete file
	        PARAMETER IO$S_MOUNT = 1
	        PARAMETER IO$V_MOUNT = 9		 !  Mount volume
	        PARAMETER IO$S_DMOUNT = 1
	        PARAMETER IO$V_DMOUNT = 10		 !  Dismount volume
	        PARAMETER IO$S_REMOUNT = 1
	        PARAMETER IO$V_REMOUNT = 11		 !  Remount volume
	        PARAMETER IO$S_MOVEFILE = 1
	        PARAMETER IO$V_MOVEFILE = 12		 !  Move a file
	        PARAMETER IO$S_RWSHELVED = 1
	        PARAMETER IO$V_RWSHELVED = 14		 !  Access shelved files
	        PARAMETER IO$S_SETDIR = 1
	        PARAMETER IO$V_SETDIR = 15		 !  Set file as a directory
 !  Bit 19 used for TRUSTED
	    BYTE %FILL (2)
	    END MAP
 !  CR (card reader) driver function modifier bits.
	    MAP
	        PARAMETER IO$S_BINARY = 1
	        PARAMETER IO$V_BINARY = 6		 !  Binary read
	        PARAMETER IO$S_PACKED = 1
	        PARAMETER IO$V_PACKED = 7
	        BYTE %FILL (1)				 !  Packed read
	    END MAP
 !  MB (mailbox) driver function modifier bits.
 !  The following modifers are for the QIO READ, WRITE and SENSEMODE
 !  functions.
	    MAP
	        PARAMETER IO$S_NOW = 1
	        PARAMETER IO$V_NOW = 6			 !  Do not wait for operation complete
	        PARAMETER IO$S_STREAM = 1
	        PARAMETER IO$V_STREAM = 7		 !  Perform stream mode operation (vs. record mode)
	        PARAMETER IO$S_READERCHECK = 1
	        PARAMETER IO$V_READERCHECK = 8		 !  Perform operation if no read channel is assigned to the
					!  Perform operation if no read channel is assigned to the mai
	        PARAMETER IO$S_WRITERCHECK = 1
	        PARAMETER IO$V_WRITERCHECK = 9		 !  Perform operation if no write channel is assigned to th
					!  Perform operation if no write channel is assigned to the ma
	        PARAMETER IO$S_NORSWAIT = 1
	        PARAMETER IO$V_NORSWAIT = 10		 !  Do not allow resource waits
 !  Bit 13 used for EXFUNC
 !  Bit 19 used for TRUSTED
	    BYTE %FILL (1)
	    END MAP
 !  More MB (mailbox) driver function modifier bits.
 !  Mailbox QIO SETMODE function modifiers.
	    MAP
	        PARAMETER IO$S_MB_ROOM_NOTIFY = 1
	        PARAMETER IO$V_MB_ROOM_NOTIFY = 6	 !  Notify when some (any) space in the mailbox is availa
	        PARAMETER IO$S_READATTN = 1
	        PARAMETER IO$V_READATTN = 7		 !  Request ast on waiting reader
	        PARAMETER IO$S_WRTATTN = 1
	        PARAMETER IO$V_WRTATTN = 8		 !  Request ast on waiting writer
	        PARAMETER IO$S_SETPROT = 1
	        PARAMETER IO$V_SETPROT = 9		 !  Set volume protection
	        PARAMETER IO$S_READERWAIT = 1
	        PARAMETER IO$V_READERWAIT = 10		 !  Wait for a read channel to be assigned to the mailbox.
	        PARAMETER IO$S_WRITERWAIT = 1
	        PARAMETER IO$V_WRITERWAIT = 11		 !  Wait for a write channel to be assigned to the mailbox.
	    BYTE %FILL (1)
	    END MAP
 !  TT driver READ function modifier bits.
	    MAP
	        PARAMETER IO$S_NOECHO = 1
	        PARAMETER IO$V_NOECHO = 6		 !  Noecho
	        PARAMETER IO$S_TIMED = 1
	        PARAMETER IO$V_TIMED = 7		 !  Timed
	        PARAMETER IO$S_CVTLOW = 1
	        PARAMETER IO$V_CVTLOW = 8		 !  Convert lower case
	        PARAMETER IO$S_NOFILTR = 1
	        PARAMETER IO$V_NOFILTR = 9		 !  No filter
	        PARAMETER IO$S_DSABLMBX = 1
	        PARAMETER IO$V_DSABLMBX = 10		 !  Disable mailbox
	        PARAMETER IO$S_PURGE = 1
	        PARAMETER IO$V_PURGE = 11		 !  Purge typeahead
	        PARAMETER IO$S_TRMNOECHO = 1
	        PARAMETER IO$V_TRMNOECHO = 12		 !  Terminators are not echoed
	        PARAMETER IO$S_REFRESH = 1
	        PARAMETER IO$V_REFRESH = 13		 !  Control-R interrupted read
	        PARAMETER IO$S_ESCAPE = 1
	        PARAMETER IO$V_ESCAPE = 14		 !  Terminate read on escape sequence
	        PARAMETER IO$S_EXTEND = 1
	        PARAMETER IO$V_EXTEND = 15
	        BYTE %FILL (2)				 !  Used by alternate class drivers
	    END MAP
 !  TT driver WRITE function modifier bits.
	    MAP
	        PARAMETER IO$S_CANCTRLO = 1
	        PARAMETER IO$V_CANCTRLO = 6		 !  Cancel control O
	        PARAMETER IO$S_ENABLMBX = 1
	        PARAMETER IO$V_ENABLMBX = 7		 !  Enable mailbox
	        PARAMETER IO$S_NOFORMAT = 1
	        PARAMETER IO$V_NOFORMAT = 8		 !  Do not format output
	        PARAMETER IO$S_BREAKTHRU = 1
	        PARAMETER IO$V_BREAKTHRU = 9		 !  Broadcast I/O
	        PARAMETER IO$S_NEWLINE = 1
	        PARAMETER IO$V_NEWLINE = 10		 !  Output a newline
	    BYTE %FILL (1)
	    END MAP
 !  TT driver SENSEMODE function modifier bits.
	    MAP
	        PARAMETER IO$S_TYPEAHDCNT = 1
	        PARAMETER IO$V_TYPEAHDCNT = 6		 !  Sense typeahead information
	    BYTE %FILL (1)
	    END MAP
 !  TT driver SETMODE subfunction modifier bits.
	    MAP
	        PARAMETER IO$S_MAINT = 1
	        PARAMETER IO$V_MAINT = 6		 !  Enable maint sub modifiers
	        PARAMETER IO$S_CTRLYAST = 1
	        PARAMETER IO$V_CTRLYAST = 7		 !  Set control Y AST
	        PARAMETER IO$S_CTRLCAST = 1
	        PARAMETER IO$V_CTRLCAST = 8		 !  Set Control C
	        PARAMETER IO$S_HANGUP = 1
	        PARAMETER IO$V_HANGUP = 9		 !  Set mode and hang up line
	        PARAMETER IO$S_OUTBAND = 1
	        PARAMETER IO$V_OUTBAND = 10		 !  Set out of band AST
	        PARAMETER IO$S_TT_CONNECT = 1
	        PARAMETER IO$V_TT_CONNECT = 11		 !  Connect to detached terminal
	        PARAMETER IO$S_TT_DISCON = 1
	        PARAMETER IO$V_TT_DISCON = 12		 !  Disconnect detached terminal
	        PARAMETER IO$S_TT_PROCESS = 1
	        PARAMETER IO$V_TT_PROCESS = 13		 !  Define controlling process
	        PARAMETER IO$S_BRDCST = 1
	        PARAMETER IO$V_BRDCST = 14		 !  Define broadcast mask
	    BYTE %FILL (2)
	    END MAP
 !  TT driver MAINTIANCE subfunction submodifier bits.
	    MAP
	        PARAMETER IO$S_LOOP = 1
	        PARAMETER IO$V_LOOP = 7			 !  Diagnostic loopback
	        PARAMETER IO$S_UNLOOP = 1
	        PARAMETER IO$V_UNLOOP = 8		 !  Diagnostic reset loopback
	        PARAMETER IO$S_LINE_OFF = 1
	        PARAMETER IO$V_LINE_OFF = 9		 !  Disable line
	        PARAMETER IO$S_SET_MODEM = 1
	        PARAMETER IO$V_SET_MODEM = 10		 !  Diagnostic modem control
	        PARAMETER IO$S_LINE_ON = 1
	        PARAMETER IO$V_LINE_ON = 11		 !  Enable line
	        PARAMETER IO$S_LOOP_EXT = 1
	        PARAMETER IO$V_LOOP_EXT = 12		 !  Diagnostic external loopback
	        PARAMETER IO$S_AUTXOF_ENA = 1
	        PARAMETER IO$V_AUTXOF_ENA = 13		 !  Enable auto XOFF
	        PARAMETER IO$S_AUTXOF_DIS = 1
	        PARAMETER IO$V_AUTXOF_DIS = 14		 !  Disable auto XOFF
	    BYTE %FILL (1)
	    END MAP
 !  TT driver out-of-band modifier bits.
	    MAP
	        PARAMETER IO$S_INCLUDE = 1
	        PARAMETER IO$V_INCLUDE = 11		 !  Include character in stream
	        PARAMETER IO$S_TT_ABORT = 1
	        PARAMETER IO$V_TT_ABORT = 12		 !  Abort current I/O
	    BYTE %FILL (1)
	    END MAP
 !  Posix terminal driver SETMODE subfunction modifier bits.
	    MAP
	        PARAMETER IO$S_POSIXINIT = 1
	        PARAMETER IO$V_POSIXINIT = 6		 !  Enable initialization subfunctions
	        PARAMETER IO$S_POSIXFLOW = 1
	        PARAMETER IO$V_POSIXFLOW = 7
	        BYTE %FILL (1)				 !  Enable flow control subfunctions
	    END MAP
 !  Posix terminal driver INIT subfunction submodifier bits.
	    MAP
	        PARAMETER IO$S_SET_POSIX = 1
	        PARAMETER IO$V_SET_POSIX = 7		 !  Set TT3$M_POSIX and set up PTC
	        PARAMETER IO$S_CLEAR_POSIX = 1
	        PARAMETER IO$V_CLEAR_POSIX = 8		 !  Clear TT3$M_POSIX (opt. delete PTC)
	        PARAMETER IO$S_SET_TERMIOS = 1
	        PARAMETER IO$V_SET_TERMIOS = 9		 !  Set up termios
	        PARAMETER IO$S_SET_PTC = 1
	        PARAMETER IO$V_SET_PTC = 10		 !  Set up all of PTC
	        PARAMETER IO$S_CLEAR_PTC = 1
	        PARAMETER IO$V_CLEAR_PTC = 11		 !  clear PTC
	        PARAMETER IO$S_FLUSH_TAB = 1
	        PARAMETER IO$V_FLUSH_TAB = 12		 !  flush typeahead buffer
	        PARAMETER IO$S_FLUSH_OUTPUT = 1
	        PARAMETER IO$V_FLUSH_OUTPUT = 13	 !  flush outstanding writes
	        PARAMETER IO$S_UPDATE_PTC = 1
	        PARAMETER IO$V_UPDATE_PTC = 14		 !  update PTC
	    BYTE %FILL (1)
	    END MAP
 !  Posix terminal driver FLOW subfunction submodifier bits.
	    MAP
	        PARAMETER IO$S_OUT_XOFF = 1
	        PARAMETER IO$V_OUT_XOFF = 8		 !  Simulate output XOFF
	        PARAMETER IO$S_OUT_XON = 1
	        PARAMETER IO$V_OUT_XON = 9		 !  Simulate output XON
	        PARAMETER IO$S_IN_XOFF = 1
	        PARAMETER IO$V_IN_XOFF = 10		 !  Simulate input XOFF
	        PARAMETER IO$S_IN_XON = 1
	        PARAMETER IO$V_IN_XON = 11		 !  Simulate input XON
	    BYTE %FILL (1)
	    END MAP
 !  Posix terminal driver READ function modifier bits.
	    MAP
	        PARAMETER IO$S_O_NONBLOCK = 1
	        PARAMETER IO$V_O_NONBLOCK = 6		 !  Nonblock
	    BYTE %FILL (1)
	    END MAP
 !  Network WRITE and READ VIRTUAL function modifier bits.
	    MAP
	        PARAMETER IO$S_INTERRUPT = 1
	        PARAMETER IO$V_INTERRUPT = 6		 !  Interrupt message
	        PARAMETER IO$S_MULTIPLE = 1
	        PARAMETER IO$V_MULTIPLE = 7		 !  Multiple write/read request 
	        PARAMETER IO$S_LOCKBUF = 1
	        PARAMETER IO$V_LOCKBUF = 8		 !  Direct I/O request
	        PARAMETER IO$S_NOBLOCK = 1
	        PARAMETER IO$V_NOBLOCK = 9		 !  Segment message w/o blocking
 !  Bit 13 used for EXFUNC
 !  Bit 19 used for TRUSTED
	    BYTE %FILL (1)
	    END MAP
 !  Network ACCESS/DEACCESS function modifier bits.
	    MAP
	        PARAMETER IO$S_ABORT = 1
	        PARAMETER IO$V_ABORT = 8		 !  Disconnect abort/connect reject
	        PARAMETER IO$S_SYNCH = 1
	        PARAMETER IO$V_SYNCH = 9		 !  Synchronous disconnect
	    BYTE %FILL (1)
	    END MAP
 !  DATALINK driver WRITE subfunction modifier bits.
	    MAP
	        PARAMETER IO$S_RESPONSE = 1
	        PARAMETER IO$V_RESPONSE = 6		 !  Transmit this packet as a response
	    BYTE %FILL (1)
	    END MAP
 !  DATALINK driver SETMODE subfunction modifier bits. 
	    MAP
	        PARAMETER IO$S_STARTUP = 1
	        PARAMETER IO$V_STARTUP = 6		 !  Start protocol
	        PARAMETER IO$S_SHUTDOWN = 1
	        PARAMETER IO$V_SHUTDOWN = 7		 !  Stop protocol
	        PARAMETER IO$S_ATTNAST = 1
	        PARAMETER IO$V_ATTNAST = 8		 !  Attention AST
	        PARAMETER IO$S_CTRL = 1
	        PARAMETER IO$V_CTRL = 9			 !  Controller (ie. not station) function
	        PARAMETER IO$S_SET_MAC = 1
	        PARAMETER IO$V_SET_MAC = 11		 !  Set MAC parameters
	        PARAMETER IO$S_UPDATE_MAP = 1
	        PARAMETER IO$V_UPDATE_MAP = 12		 !  Functional Addr Map
	        PARAMETER IO$S_ROUTE = 1
	        PARAMETER IO$V_ROUTE = 13		 !  Source Routing Ops
	    BYTE %FILL (1)
	    END MAP
 !  DATALINK driver SENSEMODE subfunction modifier bits.
	    MAP
	        PARAMETER IO$S_RD_MEM = 1
	        PARAMETER IO$V_RD_MEM = 6		 !  Read device memory
	        PARAMETER IO$S_RD_MODEM = 1
	        PARAMETER IO$V_RD_MODEM = 7		 !  Read modem status
	        PARAMETER IO$S_RD_COUNT = 1
	        PARAMETER IO$V_RD_COUNT = 8		 !  Read counters
	        PARAMETER IO$S_CLR_COUNT = 1
	        PARAMETER IO$V_CLR_COUNT = 10		 !  Clear counters
	        PARAMETER IO$S_SENSE_MAC = 1
	        PARAMETER IO$V_SENSE_MAC = 11		 !  Sense MAC parameters
	        PARAMETER IO$S_SHOW_MAP = 1
	        PARAMETER IO$V_SHOW_MAP = 12		 !  Functional Addr Map
	        PARAMETER IO$S_SHOW_ROUTE = 1
	        PARAMETER IO$V_SHOW_ROUTE = 13		 !  Source Routing Ops
	    BYTE %FILL (1)
	    END MAP
	    MAP
	        PARAMETER IO$S_MORE = 1
	        PARAMETER IO$V_MORE = 6			 !  More data follows (M-bit)
	        PARAMETER IO$S_QUALIFIED = 1
	        PARAMETER IO$V_QUALIFIED = 7
	        BYTE %FILL (1)				 !  Use qualified sub-channel (Q-bit)
	    END MAP
 !  X25 driver ACCESS function modifier bits.
	    MAP
	        PARAMETER IO$S_REDIRECT = 1
	        PARAMETER IO$V_REDIRECT = 6		 !  Redirect virtual call
	        PARAMETER IO$S_ACCEPT = 1
	        PARAMETER IO$V_ACCEPT = 7
	        BYTE %FILL (1)				 !  Accept virtual call
	    END MAP
 !  LPA-11 driver STARTDATA modifier bits.
	    MAP
	        PARAMETER IO$S_SETEVF = 1
	        PARAMETER IO$V_SETEVF = 6		 !  Set event flag
	    BYTE %FILL (1)
	    END MAP
 !  XA (DR11-W) driver function modifier bits.
	    MAP
	        PARAMETER IO$S_WORD = 1
	        PARAMETER IO$V_WORD = 6			 !  Word (interrupt)/block (DMA) mode specifier
	        PARAMETER IO$S_SETFNCT = 1
	        PARAMETER IO$V_SETFNCT = 9		 !  Set "FNCT" bits in device CSR
	        PARAMETER IO$S_DATAPATH = 1
	        PARAMETER IO$V_DATAPATH = 10		 !  Change UBA datapath (direct/buffered)
	        PARAMETER IO$S_CYCLE = 1
	        PARAMETER IO$V_CYCLE = 12		 !  Set "cycle" bit in device CSR
	        PARAMETER IO$S_RESET = 1
	        PARAMETER IO$V_RESET = 13		 !  Device reset specifier
	    BYTE %FILL (1)
	    END MAP
 !  3271 driver function modifier bits.
	    MAP
	        PARAMETER IO$S_SETCUADR = 1
	        PARAMETER IO$V_SETCUADR = 8		 !  Set a new CU address
	        PARAMETER IO$S_SETBSIZE = 1
	        PARAMETER IO$V_SETBSIZE = 9		 !  Set a new maximum buffer size
	        PARAMETER IO$S_SETPOOLSZ = 1
	        PARAMETER IO$V_SETPOOLSZ = 10		 !  Set a new pool size
	        PARAMETER IO$S_SETENQCNT = 1
	        PARAMETER IO$V_SETENQCNT = 11		 !  Set a new ENQ threshold
	        PARAMETER IO$S_CLEAR = 1
	        PARAMETER IO$V_CLEAR = 12		 !  Zero status counters
	        PARAMETER IO$S_LPBEXT = 1
	        PARAMETER IO$V_LPBEXT = 13		 !  Loopback is external loopback
	        PARAMETER IO$S_LPBINT = 1
	        PARAMETER IO$V_LPBINT = 14		 !  Loopback is internal loopback (DUP11)
	        PARAMETER IO$S_READCSR = 1
	        PARAMETER IO$V_READCSR = 15
	        BYTE %FILL (1)				 !  Read CSRs on DUP11
	    END MAP
 !  XW driver function modifier bits.
	    MAP
	        PARAMETER IO$S_NOCTSWAIT = 1
	        PARAMETER IO$V_NOCTSWAIT = 6		 !  Diagnostic function 
	        PARAMETER IO$S_SLAVLOOP = 1
	        PARAMETER IO$V_SLAVLOOP = 7		 !  Diagnostic function 
	        PARAMETER IO$S_NODSRWAIT = 1
	        PARAMETER IO$V_NODSRWAIT = 8		 !  Do not wait for DSR (diag) 
	        PARAMETER IO$S_MAINTLOOP = 1
	        PARAMETER IO$V_MAINTLOOP = 9		 !  Internal maint loop 
	        PARAMETER IO$S_LASTBLOCK = 1
	        PARAMETER IO$V_LASTBLOCK = 10		 !  Last block of message 
	        PARAMETER IO$S_INTCLOCK = 1
	        PARAMETER IO$V_INTCLOCK = 12		 !  Internal clock 
	    BYTE %FILL (1)
	    END MAP
 !  LAT driver function modifier bits.
	    MAP
	        PARAMETER IO$S_LT_CONNECT = 1
	        PARAMETER IO$V_LT_CONNECT = 6		 !  Solicit connection to remote LAT device
	        PARAMETER IO$S_LT_DISCON = 1
	        PARAMETER IO$V_LT_DISCON = 7		 !  Disconnect LAT session
	        PARAMETER IO$S_LT_READPORT = 1
	        PARAMETER IO$V_LT_READPORT = 8		 !  Read LAT device info
	        PARAMETER IO$S_LT_MAP_PORT = 1
	        PARAMETER IO$V_LT_MAP_PORT = 9		 !  Map application port
	        PARAMETER IO$S_LT_RATING = 1
	        PARAMETER IO$V_LT_RATING = 10		 !  Set service rating
	        PARAMETER IO$S_LT_SOL_INFO = 1
	        PARAMETER IO$V_LT_SOL_INFO = 11		 !  Request solicit info
	        PARAMETER IO$S_LT_RCV_INFO = 1
	        PARAMETER IO$V_LT_RCV_INFO = 12		 !  Setup to recive reply
	        PARAMETER IO$S_LT_SETMODE = 1
	        PARAMETER IO$V_LT_SETMODE = 13		 !  SETMODE on LTA device
	        PARAMETER IO$S_LT_SENSEMODE = 1
	        PARAMETER IO$V_LT_SENSEMODE = 14	 !  SENSEMODE on LTA device
	        PARAMETER IO$S_LT_QUE_CHG_NOTIF = 1
	        PARAMETER IO$V_LT_QUE_CHG_NOTIF = 15
	        BYTE %FILL (2)				 !  Queue change AST
	    END MAP
 !  LAT item list definitions for MAP_PORT
	    MAP
	        PARAMETER IO$S_LT_MAP_FILLER = 1
	        PARAMETER IO$V_LT_MAP_FILLER = 0	 !  Item 0 not used
	        PARAMETER IO$S_LT_MAP_NODNAM = 1
	        PARAMETER IO$V_LT_MAP_NODNAM = 1	 !  Server node name
	        PARAMETER IO$S_LT_MAP_PORNAM = 1
	        PARAMETER IO$V_LT_MAP_PORNAM = 2	 !  Server port name
	        PARAMETER IO$S_LT_MAP_SRVNAM = 1
	        PARAMETER IO$V_LT_MAP_SRVNAM = 3	 !  Server service name
	        PARAMETER IO$S_LT_MAP_LNKNAM = 1
	        PARAMETER IO$V_LT_MAP_LNKNAM = 4	 !  Link name
	        PARAMETER IO$S_LT_MAP_NETADR = 1
	        PARAMETER IO$V_LT_MAP_NETADR = 5	 !  Server Ethernet Add.
	    BYTE %FILL (1)
	    END MAP
 !  FSDRIVER function modifiers for Dollar.
	    MAP
	        PARAMETER IO$S_FLUSH = 1
	        PARAMETER IO$V_FLUSH = 6		 !  Flush writes
	        PARAMETER IO$S_WRITE_BARRIER = 1
	        PARAMETER IO$V_WRITE_BARRIER = 7
	        BYTE %FILL (1)				 !  Barrier writes to this point
	    END MAP
 !  MKDRIVER function modifiers for SETMODE
	    MAP
	        PARAMETER IO$S_MKFILL1 = 1
	        PARAMETER IO$V_MKFILL1 = 6		 !  Filler to not coincide with TU modifier (for safety)
	        PARAMETER IO$S_ALLOWFAST_NEVER = 1
	        PARAMETER IO$V_ALLOWFAST_NEVER = 7	 !  Disable all skip by filemarks
	        PARAMETER IO$S_ALLOWFAST_PER_IO = 1
	        PARAMETER IO$V_ALLOWFAST_PER_IO = 8	 !  Enable skip by filemarks with i/o fcn modifier
	        PARAMETER IO$S_ALLOWFAST_ALWAYS = 1
	        PARAMETER IO$V_ALLOWFAST_ALWAYS = 9	 !  Default all IO$_SKIPFILE to use skip by filemarks
	    BYTE %FILL (1)
	    END MAP
 !  Snapshot-capable disk (SD) driver function modifier bits.
	    MAP
	        PARAMETER IO$S_ADD = 1
	        PARAMETER IO$V_ADD = 6			 !  Add UNIT to an existing pool
	    BYTE %FILL (1)
	    END MAP
 !  USB usbattr modifiers
	    MAP
	        PARAMETER IO$S_IDSTRING = 1
	        PARAMETER IO$V_IDSTRING = 6		 !  Request for printer's 1284 device ID string
	        PARAMETER IO$S_SERIALNUM = 1
	        PARAMETER IO$V_SERIALNUM = 7
	        BYTE %FILL (1)				 !  Request for printer's serial number (if supported)
	    END MAP
 !  Disk-specific PACKACK modifiers 
	    MAP
	        PARAMETER IO$S_BYPASS_VALID_CHK = 1
	        PARAMETER IO$V_BYPASS_VALID_CHK = 7
	        BYTE %FILL (1)				 !  Send PACKACK to driver even if UCB$M_VALID is set (LCLDSKVALID)
	    END MAP
	END UNION
	END STRUCTURE	! IODEF
!DEC$ END OPTIONS