Radio Shack TRS-80 Model 3 Operation And Reference Manual page 234

TRS-SO MODEL III
Explanation of Error Messages
NF NEXT without FOR: NEXT is used without a matching FOR statement. This
error may also occur if NEXT variable statements are reversed in a nested
loop.
SN Syntax Error: This usually is the result of incorrect punctuation, open
parenthesis, an illegal character or a mis-spelled command.
RG
RETURN without GOSUB: ARETURN statement was encountered before a
matching GOSUB was executed.
OD
Out of Data. A READ or INPUT # statement was executed with insufficient
data available. DATA statement may have been left out or all data may have
been read from tape or DATA.
Fe Illegal Function Call: An attempt was made to execute an operation using an
illegal parameter. Examples: square root of a negative argument, negative
matrix dimension, negative or zero LOG arguments, etc. Or USR call without
first pOKEing the entry point.
OV
Overflow: The magnitude of the number input or derived is too large for the
Computer to handle. NOTE: There is no underflow error. Numbers smaller
than ± 1.701411 E - 38 single precision or ± 1.701411834544556E - 38
double precision are rounded to O. See /0 below.
OM
Out of Memory: All available memory has been used or reserved. This may
occur with very large matrix dimensions, nested branches such as GOTO,
GOSUB, and FOR-NEXT Loops.
UL
Undefined Line: An attempt was made to refer or branch to a non-existent
line.
BS Subscript out of Range: An attempt was made to assign a matrix element
with a subscript beyond the DIMensioned range.
DD
Redimensioned Array: An attempt was made to DIMension a matrix which
had previously been dimensioned by DIM or by default statements. It is a
good idea to put all dimension statements at the beginning of a program.
/0
Division by Zero: An attempt was made to use a value of zero in the
denominator. NOTE: If you can't find an obvious division by zero check for
division by numbers smaller than allowable ranges. See OV above and
RANGES page All
7.
ID .
Illegal Direct: The use of INPUT as a direct command.
TM
Type Mismatch: An attempt was made to assign a non-string variable to a
string or vice-versa.
8/2