EXAMPLE:

   ;CHANGE THE INPUT ROUTINES TO NEW SYSTEM
   LDX #<USER
   LDY #>USER
   SEC
   JSR VECTOR      ;READ OLD VECTORS
   LDA #<MYINP     ;CHANGE INPUT
   STA USER+10
   LDA #>MYINP
   STA USER+11
   LDX #<USER
   LDY #>USER
   CLC
   JSR VECTOR      ;ALTER SYSTEM
   ...
   USER *=*+26

ERROR CODES

The following is a list of error messages which can occur when using the KERNAL routines. If an error occurs during a KERNAL routine , the carry bit of the accumulator is set, and the number of the error message is returned in the accumulator.

NOTE: Some KERNAL I/O routines do not use these codes for error messages. Instead, errors are identified using the KERNAL READST routine.

NUMBER	MEANING
0	Routine terminated by the <STOP> key
1	Too many open files
2	File already open
3	File not open
4	File not found
5	Device not present
6	File is not an input file
7	File is not an output file
8	File name is missing
9	Illegal device number
240	Top-of-memory change RS-232 buffer allocation/deallocation