apple-pascal-1.3-manual

" IdentifiersAn identifier is a character string starting with a letter. The subsequentcharacters can be letters, numbers, or the ASCII underline(_). Only thefirst eight characters (not counting any underlines) are actually used by theAssembler, although more can be typed in the identifier.INote: The underline character is ignored by the Pascal Compiler andAssembler. If you declare a procedure as EXT _pRQC , it is just as if youhad declared it EXTPROC or E_x_ T _pRQC . 'The Assembler makes only one pass through the source. On encounteringan undefined identifier in an expression, the Assembler treats the identifieras an undefined label that will eventually be defined. Any identifier otherthan a label must be defined before it is used.labelsA label must begin in the first column, with no preceding spaces. A labelcan be followed by a colon; the colon will be ignored.Using the Equate directive (.EQU), a label can be defined by an expressioncontaining other labels or absolutes. A label that appears as the argument ofan Equate directive can be undefined, but the undefined label cannot thenbe defined by a later Equate directive.Assembler Informationll-177