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Spectrum BASIC errors
Following a discussion on comp.sys.sinclair about BASIC error reports, I tried to reproduce all of the errors.
Here are my findings, with a few contributions from Philip Kendall, Geoff Wearmouth, and Paul Dunn.
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0 OK
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REM
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1 NEXT without FOR
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LET n=5: NEXT n
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2 Variable not found
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PRINT x
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3 Subscript wrong
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DIM a(3): PRINT a(4)
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4 Out of memory
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10 GOSUB 10
(leave it running)
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5 Out of screen
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PRINT AT 22,0
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6 Number too big
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PRINT 1e38*1e38
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7 RETURN without GO SUB
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RETURN
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8 End of file
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OPEN #4,"m";1;"single": PRINT #4;1: CLOSE #4: OPEN #4,"m";1;"single": INPUT #4, a: INPUT #4, a
(only works with Interface 1)
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9 STOP statement
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STOP
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A Invalid argument
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PRINT SQR -1
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B Integer out of range
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CLEAR -1
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C Nonsense in BASIC
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PRINT VAL ""
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D BREAK - CONT repeats
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LOAD ""
(press Break)
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E Out of DATA
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READ x
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F Invalid file name
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SAVE ""
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G No room for line
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10 DIM a$(41450)
RUN
20 REM eeeeeeeeeeeeeee
(only works in 48K mode)
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H STOP in INPUT
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INPUT x
(enter STOP using Symb Shift + A)
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I FOR without NEXT
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FOR n=1 TO 0
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J Invalid I/O device
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INPUT #2, x
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K Invalid colour
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INK 10
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L BREAK into program
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PAUSE 1000
(press Break)
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M RAMTOP no good
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CLEAR 1
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N Statement lost
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:STOP
CONTINUE
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O Invalid stream
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PRINT #9
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P FN without DEF FN
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PRINT FN x()
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Q Parameter error
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10 DEF FN x()=1: PRINT FN x(1)
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R Tape loading error
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LOAD ""
(play a tape and stop it while loading)
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a MERGE error
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(never generated)
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b Wrong file type
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SAVE !"x": LOAD !"x" CODE
(only works on a +2)
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c CODE error
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SAVE !"y" CODE 40000,200: LOAD !"y" CODE 40000,100
(only works on a +2)
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d Too many brackets
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PLAY "((((("
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e File already exists
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SAVE !"x": SAVE !"x"
(only works on a +2)
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f Invalid name
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ERASE !""
(only works on a +2)
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g File does not exist
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(never generated)
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h File does not exist
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ERASE !"z"
(only works on a +2)
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i Invalid device
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FORMAT "printer";1
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j Invalid baud rate
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FORMAT "p";0
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k Invalid note name
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PLAY "q"
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l Number too big
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PLAY "N123456"
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m Note out of range
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PLAY "O8#########B"
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n Out of range
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PLAY "N50"
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o Too many tied notes
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PLAY "10_10_10_10_10"
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p [copyright message]
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10 PRINT "1", "2", "3", "4", "5", "6", "7", "8", "9"
POKE 23759,164 (changing PRINT to PLAY)
RUN
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Error p is a special case. It occurs when you try to PLAY more than eight channels simultaneously, which would usually be impossible: the BASIC interpreter won't accept the command, so the POKE above is the only way to produce it. The error message is the system copyright message, but should probably be something like "Too many channels". On the +3, this unused oddity is replaced by a floppy disk error ("Bad filename").
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