DOS-15 - .IOPS:
	 0 ILL FUNCTION CAL - CAL ADDR

	 1 CAL* ILL - CAL ADDR

	 2 .DAT SLOT ERROR - CAL ADDR

	 3 ILL INTERRUPT - I/O STATUS REGISTER

	 4 DEV NOT READY  - TYPE ^R WHEN READY *

	 5 ILL .SETUP CAL - CAL ADDR

	 6 ILL HANDLER FUNCTION - CAL ADDR *

	 7 ILL DATA MODE - CAL ADDR *

	10 FILE STILL ACTIVE - CAL ADDR **
	11 SEEK/ENTER/INIT NOT EXECUTED - CAL ADDR *

	12 UNRECOVERABLE DEVICE ERROR - STATUS REG B AND UNIT NO.

	13 FILE NOT FOUND - CAL ADDR **

	14 DIRECTORY FULL - CAL ADDR

	15 DEVICE FULL - CAL ADDR **

	16 OUTPUT BUFFER OVERFLOW - CAL ADDR

	17 TOO MANY FILES FOR HANDLER - CAL ADDR *

	20 DISK FAILURE (^R TO RETRY) - DISK STATUS,BLK #,DEVICE/UNIT #,CAL FUNC,UIC

	21 ILL DISK ADDR - BLOCK NO,DEVICE/UNIT NO,CAL FUNCTION,UIC

	22 TWO OUTPUT FILES ON ONE DECTAPE UNIT - CAL ADDR

	23 OUTPUT BUFFER OVERFLOW - CAL ADDR
	24 ILL UNIT NUMBER - CAL ADDR

	25 NEGATIVE OR 0 CHARACTER COUNT (IOPS ASCII WRITE)

	   X OR Y INCREMENT TOO LARGE (>2**14) (BINARY WRITE)
	27 ILLEGAL WRITE TYPE
	30 API SOFTWARE LEVEL ERROR - API STATUS REG
	31 NON-EXISTENT MEMORY REF - PC 
	32 MEMORY PROTECT VIOLATION - PC
	33 MEMORY PARITY ERROR - PC
	34 POWER FAIL SKIP NOT SETUP - PC
	35 CONTROL CHARACTER TYPED WHEN RECOVERY NOT POSSIBLE 
	   - CONTROL CHARACTER ROUTINE ADDRESS

	37 LINE OVFLO - CAL ADDR

	40 HEADER LABEL ERROR - CAL ADDR

	41 DIRECTORY FORMAT ERROR - CAL ADDR

	42 ACCESSIBILITY MAP OVFLO - CAL ADDR

	43 DIRECTORY RECORDING ERROR - CAL ADDR

	44 LOGICAL EOT FOUND - CAL ADDR

	45 LONG INPUT RECORD - CAL ADDR

	46 ATTEMPT TO DELETE SYSTEM FILE - CAL ADDR

	47 ILL HORIZONTAL TAB - CAL ADDR
	51 ILLEGAL USER FILE DIRECTORY - CAL ADDR **

	55 NO BUFFERS/TCB AVAILABLE - CAL ADDR *

	61 PARITY ERROR IN DIRECTORY OR FILE BIT MAP - CAL ADDR *

	63 PROTECTED USER FILE DIRECTORY - CAL ADDR *

	64 PROTECTED FILE - CAL ADDR **

	65 UNRECOVERABLE MAGTAPE/TELECOMUNICATIONS ERROR - STATUS WORD

	66 RELATIVE BLOCK IS 0 OR NOT WITHIN FILE SCOPE (.RTRAN) **

	67 I/O BUFFER LOCATED ABOVE 32K BOUNDARY - CAL ADDR

	   .RTRAN ARGUMENTS CAUSE DATA BLOCK OVERFLOW - CAL ADDR **

	70 BUFFER SIZE TOO SMALL - CAL ADDR *

	71 EMPTY UIC **

	72 INPUT PARITY OR WRITE CHECK ERROR (^R TO RETRY)

	    - CALADDR,BLOCK NO,DEVICE/UNIT NO,CAL FUNCTION,UIC

	73 NULL FILE NAME GIVEN ON SEEK/ENTER/DLETE/FSTAT/RAND *

	74 FILE STRUCTURE DEGRADATION - ATTEMPT TO CLEAR SUBMAP

	   BIT THAT WAS ALREADY OFF **

	75 FILE STRUCTURE DEGRADATION - ILLEGAL SUBMAP WORD1

	76 FILE STRUCTURE DEGRADATION - ILLEGAL BACKWARD POINTER FOR FIRST

	   MFD OR UFD BLOCK (^R TO RETRY)

	77 ATTEMPTED USE OF NON-EXISTANT ^Q AREA

	  *          DISK ONLY:

	             CAL ADDR,DEVICE AND UNIT NO.,CAL FUNCTION,UIC

	  **         DISK ONLY:

	             CAL ADDR,DEVICE AND UNIT NO.,CAL FUNCTION,UIC,FILE NAME

 UC-15 ERROR MESSAGES

	FORM: IOPSUC TSK ###

 WHERE TSK IS ONE OF THE FOLLOWING:

	EST	STOP I/O TASK

	ESD	SOFTWARE DRIVER

	RKU	DISK CARTRIDGE

	DTU	DECTAPE

	LPU	LINE PRINTER

	CDU	CARD READER

	PLU	X-Y PLOTTER

	ESP	SPOOLER

	EMA	MAC-11

	PRX	POLLER

	LVU	LV-11 ELECTROSTATIC PRINTER/PLOTTER

 AND ### IS ONE OF THE FOLLOWING:

	3  ILLEGAL INTERRUPT TO DRIVER

	4  DEVICE NOT READY

	12 DEVICE FAILURE

	15 SPOOLER DISK AREA FULL

	20 SPOOLER DISK FAILURE

	25 XY PLOTTER - VALUE TOO LARGE FOR PLOTTING

	26 SPOOLER TERMINATED UNEXPECTEDLY

	27 XY PLOTTER - INCORRECT MODE

	45 GREATER THAN 80 COLUMNS IN CARD

	55 NO SPOOLER BUFFERS AVAILABLE

	72 ILLEGAL PUNCH COMBINATION

	74 TIMING ERROR - CARD COLUMN LOST - RETRY CARD

	75 HARDWARE BUSY - DRIVER NOT BUSY

	76 HARDWARE ERROR BETWEEN CARDS

	77 UNRECOGNIZED TASK REQUEST

	200 NON-EXISTANT TASK REFERENCED

	300 ILLEGAL API LEVEL GIVEN.

	400 SPOOLER EMPTY - PDP-15 INPUT REQUEST PENDING

	    ILLEGAL DIRECTIVE CODE GIVEN

	500 NO FREE CORE IN PDP-11 LOCAL MEMORY

	600 ATL NODE FOR THIS TCN MISSING

	601 FREE CORE MAP FOR LOCAL MEMORY IS BAD

	602 TCB ADDRESS GREATER THAN 28K

	777 REQUEST NODE WAS NOT AVAILABLE
 LOADER ERRORS - .LOAD OR .SYSLD
	 1 MEMORY OVERFLOW
	 2 DATA ERROR
	 3 SUBR NOT FOUND
	 4 .DAT SLOT ASSIGNMENT ERROR
	 5 PROG SEGMENT GREATER THAN 4K (PAGE MODE)
	 6 COMMON BLOCK LENGTH GREATER THAN 32K-1 WORDS
	 7 RELOCATED VALUE OF SYMBOL GREATER THAN 32K-1
	 8 ATTEMPT TO INITIALIZE A LOCATION OUTSIDE THE
	   RANGE OF THE CURRENT PROGRAM OR COMMON BLOCK
	 9 WARNING -- MORE THAN ONE HANDLER LOADED FOR
	   A DEVICE, THE LOADING PROCESS CONTINUES
 OBJECT TIME SYSTEM ERRORS - .OTS

	 5 ILL REAL SQUARE ROOT ARG

	 6 ILL DOUBLE SQUARE ROOT ARG

	 7 ILL INDEX IN COMPUTED GOTO

	10 ILL I/O DEV #

	11 ILL INPUT DATA

	12 ILL FORMAT STATEMENT

	13 ILL REAL LOG ARG

	14 ILL DOUBLE LOG ARG

	15 ZERO RAISED TO ZERO OR NEGATIVE POWER

	16 ATAN2(0.0,0.0)

	17 DATAN2(0.000,0.000)

	21 UNDEFINED FILE

	22 ILLEGAL RECORD SIZE

	23 SIZE DISCREPANCY 

	24 TOO MANY RECORDS OR ILLEGAL RECORD #

	25 MODE DISCREPANCY

	26 TOO MANY OPEN FILES

	30 SINGLE INTEGER OVERFLOW 

	31 EXTENDED (DOUBLE) INTEGER OVERFLOW 
	32 SINGLE FLT. OVERFLOW

	33 DOUBLE FLT. OVERFLOW

	34 SINGLE FLT. UNDERFLOW

	35 DOUBLE FLT. UNDERFLOW

	36 FLT. DIVIDE CHECK

	37 INTEGER DIVIDE CHECK

	40 ILLEGAL CHARACTER COUNT

	41 ARRAY EXCEEDED

	42 BAD INPUT DATA

	50 FPP MEMORY PROTECT/NON-EXISTANT MEMORY VIOLATION

	51 ILLEGAL I/O DIRECTION CHANGE TO DISK 
