Error Code = 3 AOS Stack Full.

Exceeded the limit of eight pending math operations.
Exceeded the limit of 15 levels of parentheses.

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Error Code = 14 Files in Use.

Attempted to partition already occupied file space as program memory or data registers.

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Error Code = 7 Illegal Field.

Most significant digit of SBA field is zero or greater than six.
Register specified for indirect addressing contains a value with an exponent greater than three (STB, RCB, RF, SF, TF, WID, COL, CHR, FIX, DEV, SBA, or SHW).
Exceeded 99 for the SF, RF, or TF field
Exceeded 80 or entered 0 for the COL or WID field
Exceeded 255 for the CHR field
Exceeded 9 for the FIX field
Exceeded 255 or entered 0 for the DEV field
Exceeded 8 for the SHW field
Entered a non-ASCII field for NAM, PUT, GET, DF, DFN, DFA, SBL, RD, WRT, VFY, or GTL.

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Error Code = 20 Inadequate Space.

Attempted the PUT function when non enough room is in the directory
Attempted the GET or RD function when not enough room is in the partition
Requested too many program steps or registers in the partition

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Error Code = 8 Invalid Address.

Addressed a program step larger than the current partition
Attempted to direct program execution past the end of the program memory
Main memory or file address is specified with HEX digits

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Error Code = 2 Invalid Argument.

Attempted to take the common or natural logarithm of a number less than or equal to zero
Attempted to take the square root of a negative number
Attempted to raise a negative number to a power other than positive or negative integers
Attempted to determine the root of a negative number
Attempted to take the arcsine or arccosine of a number greater than 1 or less than -1
Attempted to take the sine, cosine, or tangent of an angle greater than π/2 x 10¹⁰ radians
Attempted to take the hyperbolic arccosine of a value less than 1
Attempted to take the hyperbolic arctangent of a value greater than 1, less than -1, or equal to ±1

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Error Code = 12 Invalid Dir/File.

Failed to find the specified file (RUN, SBA, GET, F1-F5, RTN, etc.)
Failed to find the specified directory (RUN, SBA, etc.)
Directory PGM or library cartridge name was specified in the alpha register and used for SBA 6xx
Attempted to rename a module with no RAM cartridge in the port
No program files in chosen directory for RUN function
No Directory present for file functions (PUT, GET, CD, NAM, CAT, or DF)
Used a "+" as the first character in a program file name

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Error Code = 13 Invalid Entry.

Attempted an illegal factorial operation (factorials operate only on positive whole integers, zero, and positive and negative half integers)
Attempted to store a number greater than 255 with the STB function
Requested more than 6200 file bytes when partitioning
Specified a negative value or zero for PUT or WRT register file
Attempted to use the nPr, nCr, LCM, or PF functions for input other than positive integers

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Error Code = 9 Invalid Register.

Attempted to address a data memory outside the current partitioning
Attempted to PUT or WRT a data file larger than the current data memory partitioning
Most significant digit of a four-digit register address is not 0, 2, 3, or 6
Attempted to access a system register outside the range 0-139
Specified the last user register or system registers 0-16 for CIO
Attempted STA or RCA within the last nine user registers or within the first 16 or last nine system registers

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Error Code = 6 Invalid Sequence.

Attempted SBA 5xx outside a library cartridge
Attempted RCB with an address in the system ROM
Attempted to use a flag greater than 15 outside a program or system mode

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Error Code = 4 I/O Error nnn

Return status from CIO is not zero (value in display will be error code. 39 shown for example). Actual status is the value shown.

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Error Code = 11 Label Not Found.

Addressed a label that does not exist in the current program (can be file or program memory)

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Error Code = 5 No Data Found.

Attempted to store an empty program file to directory or tape.

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Error Code = 15 No Solution.

Attempted to compute mean when there are zero or fewer points
Attempted to compute standard deviation, r, m-b, x', or y' when there are one or fewer points
Attempted to compute x' when slope is zero
Computed the correlation coefficient of a data set with zero or infinite slope

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Error Code = 1 Overflow.

Calculated a result that exceeds the numeric range of the calculator
Divided by zero
Raised zero to a power less than zero
Attempted to calculate the tangent of 90⁰ or 270⁰, π/2 or 3π/2 radians, 100 or 300 grads, or their rotational multiples, such as 405⁰
Attempted to take the factorial of a number larger than 69.5

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Error Code = 10 SBR Stack Full.

Exceeded the limit of eight nested subroutines

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**********

Although not an error message, this indicates you tried to convert a number from decimal to hexadecimal or octal which is too large to be displayed.