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                STRUCTURED PROGRAMMING MACROS
                ------------------------------
0
 The structured programming macros available  on the DAWS are
 those described  in the BIOMAC  User's Manual,  with certain
 adaptions.   The  macros provide  facilities  for  composing
 programs of blocks by the operations of selection repetition
 and concatenation.
0The  following macros  are  available  in the  system  macro
 library on the DAWS:
0          IF\B]
           IFC
           AND\B]
           OR\B]
           EXBND\B]
           INBND\B]
           CASE\B]
           ASSERT ASSERB
           ELSE
           END
           WHILE\B]
           REPEAT
           UNTIL\B]
           FOR
           STRMACS
           NOTE
           ENDCHK
0The following local changes to the macros are in effect:
0       1) The  macro  STRMACS  should be  invoked  to  MCALL
           necessary   inner  macros   and  define   assembly
           symbols.  All  other macros (such  as IF  and END)
           Sshould be MCALL`ed as appropriate.
0       2) The  macro  .USE   specifies  whether  branch/jump
           instruction pairs or branches are emitted.
0          The statement
0               .USE JUMPS
0          forces the omission of branch/jump pairs.
0          The statement
0               .USE BRANCHES
0          forces the emision of branches.  The default is to
           emit branches.
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                                                       PAGE 2
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        3) The  variable   .LIST  controls  the   listing  of
           generated labels.   If .LIST  has a  value greater
           than 0,  generated labels are  listed.  Otherwise,
           labels are not listed.  The default is .LIST = 0.
0       4) The IFC macro has had  a optional fourth parameter
           added.   If  this  parameter is  REGS,  the  macro
           generates  code  assuming  all  arguments  are  in
           register  and that  the register  contents may  be
           destroyed in evaluating the condition.
0       5) All  macros   involving  conditions   require  the
           comparison operator (LE, EQ etc.) to always be the
           second parameter.  Thus, write
                            IF ,LE
           not
                            IF LE
           as written up in the documentation.
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