CALL OTSERR( IERR )  --  This subroutine provides the user
 with a means to generate OTS error messages and traceback
 information.  IERR is the OTS error code, some of which
 are listed below.
 
	IERR	Description
	
	1	Invalid error call.
	80	Wrong number of arguments.
	81	Invalid argument.
	98	User requested traceback.
 
 Available qualifiers are:
 
 MACRO		How to put traceback information into a MACRO routine.
 NUMBERS	Complete list of OTS errors.
3 MACRO
 To get the traceback information incorporated into a MACRO routine,
 include the following statements at the entry point.
 
	MOV	NAME+2,-(SP)		;STORE LAST 3 CHARACTERS OF NAME
	MOV	NAME,R4			;AND FIRST 3
	JSR	R$,NAM$			;SET NAME INTO TRACBACK LIST
	.
	.
	.
 NAME:	.RAD50	/NAME  /		;6 CHARACTER NAME IN RADIX-50.
 
 To note which line you're at,
 
	MOV	#n,$SEQC		;FOR "at line n"
	MOV	#-n,$SEQC		;FOR "at or after line n"
3 NUMBERS
 1  Invalid error call
 2  Task initialization failure
 3  Odd address trap (SSTO)
 4  Segment fault (SST1)
 5  T-bit or BPT trap (SST2)
 6  IOT trap (SST3)
 7  Reserved instruction trap (SST4)
 8  Non-RSX EMT trap (SST5)
 9  TRAP instruction trap (SST6)
 10 PDP-11/40 FIS trap (SST7)
 11 FPP hardware fault
 12 FPP illegal opcode trap
 13 FPP undefined variable trap
 14 FPP maintenance trap
 20 REWIND error
 21 Duplicate file specifications
 22 Input record too long
 23 BACKSPACE error
 24 End-of-file during read
 25 Record number outside range
 26 Access mode not specified
 27 More than one record in I/O statement
 28 Close error
 29 No such file
 30 Open failure
 31 Mixed file access modes
 32 Invalid logical unit number
 33 ENDFILE error
 34 Unit already open
 35 Segmented record format error
 36 Attempt to access nonexistent record
 37 Inconsistent record length
 38 Error during write
 39 Error during read
 40 Recursive I/O operation
 41 No buffer room
 42 No such device
 43 File name specification error
 44 Inconsistent record type
 45 Keyword value error in OPEN statement
 46 Inconsistent OPEN/CLOSE parameters
 47 Write to read-only file
 48 Unsupport I/O operation
 49 Invalid key specification
 50 Inconsistent key change or duplicate key vlue
 51 Inconsistent file organization
 52 Specified record locked
 53 No current record
 54 REWRITE error
 55 DELETE error
 56 UNLOCK error
 57 FIND error
 59 List-directed I/O syntax error
 60 Infinite format loop
 61 Format/variable-type mismatch
 62 Syntax error in format
 63 Output conversion error
 64 Input conversion error
 65 Format too big for 'FMTBUF'
 66 Output statement overflows record
 67 Record too small for I/O list
 68 Variable format expression value error
 70 Integer overflow
 71 Integer zero divide
 72 Floating overflow
 73 Floating zero divide
 74 Floating underflow
 75 FPP floating to integer conversion overflow
 80 Wrong number of arguments
 81 Invalid argument
 82 Undefined exponentiation
 83 Logarithm of zero or negative value
 84 Square root of negative value
 86 Invalid error number
 91 Computed GOTO out of range
 92 Assigned label not in list
 93 Adjustable array dimension error
 94 Array reference outside array
 95 Incompatible FORTRAN object module in task
 96 Missing format conversion routine
 97 FTN FORTRAN error call
 98 User requested traceback
 100 Directive:  Missing argument(s)
 101 Directive:  Invalid event flag number
 111 Virtual array initialization failure
 112 Virtual array mapping error