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SBASIC Manual - Page 54

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     SBasic User's Manual     SBasic Version 2.7             Page 54
     Printed:  December 5, 1999
     known variables, constants, and labels.  If found, the underscore and
     following characters are replaced with SBasic's internal name.  Since
     this internal name is what the assembler will use to resolve operands,
     the SBasic name will be understood by the assembler.  In the above
     example, SBasic would convert the string "_time" to something like

     SBasic can handle multiple occurences of underscores within a source
     line.  For example, it will properly resolve a line such as:

         ldx   #_main+2*_cons0               uses a label and a constant

     If SBasic cannot resolve the character string following an underscore
     into the name of a variable, constant, or label, the line is passed
     unchanged to the output file.  This will usually result in an
     assembler error message, but it will not cause an SBasic error!  This
                                  it will not cause an SBasic error!
     means that if you use inline assembly language, you must check not
     only for SBasic errors but for assembler errors as well.  SBasic will
     not know that the assembler could not resolve the label.

     It is easy to lose track of which addresses are known to SBasic and
     which are known to the assembler.  Remember that labels known to
     SBasic are automatically converted to an internal label before SBasic
     writes them to the output file.  Thus, your SBasic source may refer to
     a label WAMPUM, but it will be converted to something like lbl010
     before the assembler sees it.

     To refer to standard assembler labels such as I/O registers, make sure
     that you make them known to the assembler by including them within an
     ASM section.  The above example could have been written:

         asm                            ' switch to assembly language

         iobase  equ   $1000            address of I/O regs
         tcnt    equ   $0e              offset to TCNT reg
                 ldx   #ioregs          point x at i/o regs
                 ldd   tcnt,x           get 16-bit counter TCNT
                 std   _time            save in variable TIME

         endasm                         ' switch back to SBasic
         return                         ' and return