(a)
NAMTAB
   .
   .
   .
   RDBUFF ptr_to_start ptr_to_finish 
   .
   .
   .


DEFTAB
   RDBUFF &INDEV, &BUFADR, &RECLTH
   CLEAR  X
   CLEAR  A
   CLEAR  S
  +LDT    #4096
   TD     =X'?1'
   JEQ    *-3
   RD     =X'?1'
   COMPR  A,S
   JEQ    *+11
   STCH   ?2,X
   TIXR   T
   JLT    *-19
   STX    ?3
   MEND
   .
   .

(b)
ARGTAB
   F1
   BUFFER
   LENGTH

   Figure 4.4 Contents of macro processor tables for the program in Fig 4.1:
   (a) entries in NAMTAB and DEFTAB defining macro RDBUFF, (b) entries in
   ARGTAB for invoctaion of RDBUFF on line 190