Sinclair Spectrums have error codes from through to R with some extras if you have +3DOS (ie. you have a +3 or a +2A).

The following is a list of all errors, what they mean, and a short Sinclair BASIC program that will produce that error if you type it in and run on your spectrum.

0 OK
The program or statement completed succesfully. Not really an error.
Example: PRINT
1 NEXT without FOR
A NEXT statement was seen before its corresponding FOR.
Example: NEXT N
2 Variable not found
A variable was referenced that has not yet been assigned a value.
Example: PRINT foo
3 Subscript wrong
An attempt was made to access an element beyond the bounds of an array.
Example: DIM f(10) : PRINT f(11)
4 Out of Memory
There is not enough free memory to perform the action.
Example: DIM d(1000,1000,1000,1000,1000,1000)
5 Out of Screen
An INPUT statement has tried to generate more than 23 lines in the lower half of the screen. Also occurs with PRINT AT 22,xx
Example: PRINT AT 22,10;"cheese"
6 number too big
A function has tried to calculate a number bigger that approx. 1038
Example: PRINT 10e30*10e30
7 RETURN without GOSUB
The system has encountered a RETURN statement but has seen no GO SUB statement to RETURN to.
Example: RETURN
9 STOP statement
Not really an error, a STOP statement has been encountered, causing the program to, ahem, stop.
Example: STOP
A Invalid argument
The argument to a function is invalid for some reason.
Example: PRINT USR "boing! boing!"
B Integer out of range
The number supplied as a parameter to a function which requires an integer was to big or small.
Example: GO TO 1e999
C Nonsense in BASIC
Means something silly has occurred, could be that the BASIC interperator has reached random data.
Example: PRINT VAL "Boing!!"
D BREAK - CONT repeats
The BREAK key has been pressed during some hardware action. After this error CONTINUE will start before the current statement and repeat it. Compare this with error L
Example: SAVE "ping"
Then press BREAK
E Out of DATA
A READ statement has run out of DATA elements. You've tried to READ past the end of the DATA (or there is no DATA).
Example: READ a
F Invalid Filename
You tried to SAVE with filename empty (or longer than 10 characters using tape)
Example: SAVE ""
G No room for line
There is not enough room in memory to enter the current line into the listing.
H STOP in INPUT
STOP has been entered as the response to an INPUT command.
Example: INPUT a
Then type STOP (as a token not as a word)
I FOR without NEXT
There was a FOR loop to be executed no times and the corresponding NEXT statement could not be found.
Example: FOR n=1 TO 0
J Invalid I/O device
You are attempting to input characters from (or output charaters to) a device that doesn't support it. For example, it is not possible to input characters from the screen stream.
Example: INPUT #2, a$
K Invalid colour
A colour has been referenced that doesn't exist.
Example: INK 69
L BREAK into program
The BREAK key has been pressed to gain access to a running program.
M RAMTOP no good
RAMTOP is the address of the high boundary of the BASIC program. This error means that the number specified for RAMTOP is either too big or too small.
Example: CLEAR 1089
N statement lost
If you're running a long string of commands from the command-line, but an error occurs you may want to CONTINUE. However, the speccy will only store the first few statements in memory, if the error was after that, you'll see this error.
O Invalid stream
Some sort of undocumented error has occured during communication with a Sinclair microdrive.
P FN without DEF
A user-defined function has been referenced without actually having been defined.
Example: PRINT FN a(2)
Q Parameter error
Wrong number of arguments, or one of them is the wrong type (string instead of number or vice versa).
R Tape loading error
Loading from tape failed. Have you been storing your tapes correctly? Does your head need cleaning or realligning?
Example: LOAD ""
Start loading something, then half way through, stop the tape :-)
If we're talking about errors in the Sinclair Spectrum's ROM, there are lots of little ones which do not warrant mention here, some mysterious, never-executed code left over from the development process, and a few larger anomalies which merit further discussion. The feature whereone one could hold down a keyword key and rapidly fill the screen with RANDOMIZE RANDOMIZE RANDOMIZE RANDOMIZE etc was a bug, although a mesmerising one.

Firstly, there was the famous '-65536' bug, in which a muddle over the treatment of 8-bit numbers resulted in 'PRINT INT -65536' returning '-1' on all models of Spectrum.

Secondly, at the 'Scroll?' prompt, if you typed'Caps Lock', 'True Video' and some of the other function keys, the screen would quickly fill with random nonsense dragged from the memory addresses of the character set onwards, followed by an 'Invalid Colour' error.

Thirdly, on a 128k or later machine, typing 'FLASH 1' into Sinclair 128K BASIC caused the text to flash - which is expected - but it also caused the Spectrum's menu system to flash, as well. Yes, long before BLINK came and went, there was FLASH. FLASH was better.

Most amusing of all, however, was the suicidal 'Invalid Device Expression, 1000:1' error - an error message which could appear under certain circumstances when using a 128k machine with an Interface 1. It's one character longer than a single line, and when it is displayed it overflows the screen and causes the machine to crash; thus it is an error message which itself causes an error.

Bloody all of the bastards:
http://www.nonowt.com/magfold/articfol/bugs_in.html

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