CFA

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CFA pfa — cfa

    Convert the parameter field address of a definition to its code field address

nbvbmbv

NFA:    006A47 83             DB   83H
        006A48 4346           DB   "CF"
        006A4A C1             DB   'A'+80H
LFA:    006A4B 396A           DW   LFA-6
CFA:    006A4D 3C28      CFA: DW   DOCOL        ;   :
PFA:    006A4F C767 4B69      DW   TWO,SUBB     ;   2 -
        006A53 1725           DW   SEMIS        ;   ;

The Meaning of the Dictionary Fields:

NFA   LFA   CFA   PFA

CFA     pfa   ---   cfa

        Convert the parameter field address of a definition to its code field address

The Role of the Code Field Address

“A dictionary entry or a word must have a header which consists of a name field, a link field, and a code field. The body of the word is contained in the parameter field right after the code field. The header is created by the word CREATE and its derivatives, which are called defining words because they are used to create or define different classes of words. All words in the same class have the same code field address in the code fields. The code field address points to a code routine which will interpret this word when this word is to be executed. The structure of a definition as compiled in the dictionary is shown in Fig. 4.” (Ting 2013, p. 29)

References:

Ting, C. H., 2013. Systems Guide to fig-Forth [online]. 3rd ed. San Mateo, CA 94402, USA: Offete Enterprises, Inc. Available from: http://figforth.org.uk/library/Systems.Guide.to.figForth.pdf.