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COBOL.INS -- Installation Guide for COBOL-68/74 V12A






























COPYRIGHT (C) 1979 BY
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.


THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND  COPIED
ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH  LICENSE AND WITH THE
INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR  ANY  OTHER
COPIES  THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE  SOFTWARE  IS  HEREBY
TRANSFERRED.

THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE  WITHOUT  NOTICE
AND  SHOULD  NOT  BE  CONSTRUED  AS  A COMMITMENT BY DIGITAL EQUIPMENT
CORPORATION.

DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR  RELIABILITY  OF  ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 2












                    CONTENTS
                    --------

CHAPTER   1         INTRODUCTION

CHAPTER   2         CONTENTS OF DISTRIBUTION TAPE

CHAPTER   3         SYSTEM INSTALLATION

CHAPTER   4         SYSTEM REBUILDING
          4.1       Required System Software
          4.2       Standard Configuration
          4.3       Non-Standard Configurations
          4.3.1     DBMS
          4.3.2     SORT
          4.3.3     User OTS Routines
          4.3.4     MCS
          4.3.5     KI-10 Processor
          4.3.6     Single Segment Compiler
          4.4       COMPUTE Statement
          4.5       I/O Performance Metering (LSTATS)

CHAPTER   5         COMPATIBILITY OF COBOL-68 AND COBOL-74
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 3


1.0  INTRODUCTION

This document describes procedures for building  and  installation  of
all  supported COBOL-68/74 system configurations.  It assumes that the
installation is licensed for COBOL-68, COBOL-74, and SORT.  If this is
not  true  then  the  instructions will still be valid but the certain
save sets will be empty and certain files will  be  missing  from  the
first save set.  See sections 2 and 3 for more details.

The distributed compilers are prepared to support DBMS-10 and MCS-10 ,
however, they run perfectly well without them.  The only difference is
that the DBMS-10 and MCS-10 reserved words are always active under the
version  12A standard configuration.  This was done to simplify adding
of DBMS-10 and MCS-10 to user systems, and to  simplify  and  increase
the  reliability  of  packaging  and  installation  procedures.   Most
configurations can be generated simply by reloading  portions  of  the
system.   System  installation of the distributed configuration can be
accomplished by simply  copying  a  set  of  files  according  to  the
instructions in Section 3.

In order to obtain a configuration other than that distributed, all or
part  of  the  COBOL-68/74  system must be rebuilt before installation
according to the appropriate set of procedures in Section 4.

NOTE, look carefully at the beware files, CBL12A.BWR and SRT4B.BWR and
apply all necessary patches, also read CBL12A.DOC and SRT4B.DOC.
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 4


2.0  CONTENTS OF THE DISTRIBUTION TAPE

This distribution tape is written  in  BACKUP  INTERCHANGE  format  at
either  1600  or 800 BPI and contains the complete COBOL-68/74 system.
There are eleven save sets.  If any save sets are empty then  you  are
not licensed to receive their contents.

The save sets are:

           1.  DOCUMENTATION
           2.  COBOL-SOURCE
           3.  SORT-SOURCE
           4.  COBOL-68-KL-BUILD
           5.  COBOL-68-KI-BUILD
           6.  COBOL-74-KL-BUILD
           7.  COBOL-74-KI-BUILD
           8.  SORT-KL-BUILD
           9.  SORT-KI-BUILD
          10.  SORT-KA-BUILD
          11.  LSTATS

The DOCUMENTATION save set contains the following files:

          COBOL.INS  -- this file
          COBOL.SD   -- directory of COBOL-SOURCE save set
          SORT.SD    -- directory of SORT-SOURCE save set
          COBOL.6LD  -- directory of COBOL-68-KL-BUILD save set
          COBOL.6ID  -- directory of COBOL-68-KI-BUILD save set
          COBOL.7LD  -- directory of COBOL-74-KL-BUILD save set
          COBOL.7ID  -- directory of COBOL-74-KI-BUILD save set
          SORT.KLD   -- directory of SORT-KL-BUILD save set
          SORT.KID   -- directory of SORT-KI-BUILD save set
          SORT.KAD   -- directory of SORT-KA-BUILD save set
          CBL12A.BWR -- the Beware file for COBOL-68/74 12A
          CBL12A.DOC -- the Doc file for COBOL-68/74 12A
          SRT4B.BWR  -- the Beware file for SORT 4B
          SRT4B.DOC  -- the Doc file for SORT 4B
          IOPERF.MEM -- information about the LSTATS project
          CRELD.DOC  -- the Doc file for CRELD (for LSTATS)
          RUNTIM.DDT -- DDT patch file for 6.03A only

The COBOL-SOURCE save set contains all the source  files  required  to
build  both  COBOL-68  and  COBOL-74.   There is no need to load these
files onto the disk unless you want to rebuild the COBOL-68/74 system.
The building of the complete COBOL system requires about 10,000 blocks
of free disk space and about 1 hour of CPU time on a KL-10.

The SORT-SOURCE save set contains all the  source  files  required  to
build the stand alone SORT and the COBOL SORT.

The COBOL-68-K*-BUILD and COBOL-74-K*-BUILD  save  sets  contains  the
REL,  LOG,  UNV  files etc.  from the final build.  These files can be
used to rebuild the corresponding compiler if only minor changes  have
been made (i.e.  bug fixes) rather than a feature test switch change.
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 5


Similarly the SORT-K*-BUILD save sets contain the REL, LOG, UNV  files
etc.  from the final SORT build.

The LSTATS area contains a version of the OTS which contains  the  I/O
performance  measurement  package.   If you wish to participate in the
LSTATS project, refer to Section 4.5 for detailed instructions.
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 6


The following is a  general  description  of  the  COBOL-68/74  system
components  and  the classes of files on the distribution tape.  For a
specific list of the files associated with a  given  system  component
please refer to the control file for that component.

The components of the COBOL-68/74 system are:

     COBOL          the COBOL-68 compiler

     CBL74          the COBOL-74 compiler

     LIBOL          the COBOL-68 object time system

     C74OTS         the COBOL-74 object time system

     COBDDT         the debugger

     RERUN          the recovery system

     ISAM           ISAM utility program

     LIBARY         source library maintenance program

     SORT           Sort package

     DBMS-10*(1)    Data Base Management System

     MCS-10*(1)     Message Control System



NOTE, both COBOL-68 and  COBOL-74  build  COBDDT,  ISAM,  LIBARY,  and
RERUN.   COBDDT,  LIBARY,  and RERUN are independent of COBOL-68/74 so
either method produces identical files.  ISAM contains part of the OTS
so  that  the  two  versions of ISAM have different checksums but will
behave the same.  For consistency it is recommended that the  COBOL-68
generated  version be used.  This conflict will be resolved in version
13.









---------------
*(1)  DBMS-10 and MCS-10 system components are not  included  in  this
distribution  area,  excepting  some  small support portions contained
within other of the system components.  In order to build and  install
a  system  supporting  one  or more of these unbundled products please
refer to the appropriate sections of this document in conjunction with
the  installation  instructions included with the individual unbundled
component distributions.
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 7


The following files or sets of files are included in the distribution:

     CBL12A.DOC Each component has a  documentation  section  in  this
               file.

     COBOL.INS This installation guide.

     *.HLP     Each component has a help text  file  for  use  by  the
               system HELP command.

     *.CTL     Each component has a control file which may be  run  to
               rebuild  the  given  component.   Refer to section 4 of
               this   document   for   general    system    rebuilding
               instructions and submission instructions.

     *.LOG     .LOG files recording the building  of  the  distributed
               system.

     *.EXE     The set of shareable files that compose the distributed
               ready to install system.

     *.MAP     LINK load maps for each component.

     *.MAC     MACRO source files.

     *.REL     Relocatable binary files.

     *.UNV     Universal files.

     COBOL.TEC File containing installation  specific  logical  names.
               This file is read by the COBOL CTL files.

     *.CMD     LINK indirect loading command files for the components.

     *.RN?     RUNOFF source  files  for  included  .DOC  files.   The
               specific  names  and  extensions  of  these  files  are
               referenced in their associated final .DOC files.
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 8


3.0  INSTALLATION OF THE COBOL SYSTEM

This section details the  procedure  for  installing  the  COBOL-68/74
system.  This procedure applies to the installation of systems rebuilt
to support one or more of the unbundled system components as  well  as
installation of the distributed form.

If it is not necessary to support DBMS ,MCS  or  any  of  the  special
configurations  described in section 4 only the files mentioned in the
remainder of this section need to be obtained  from  the  distribution
tape.   If  one  or  more  of  the  unbundled  components  or  special
configurations is to be supported please refer to section  4  of  this
document   for   details   of   required   files  and  procedures  for
restructuring the system before installation.   Instructions  for  the
installation  of the unbundled components themselves are included with
the unbundled distribution packages.


To install COBOL use the following procedure:

A.  Mount the COBOL distribution tape on MTA0:

B.  Type the following commands:

First decide if you want KL-10 or KI-10 (also KA-10) COBOL.

For COBOL-68
                R BACKUP
                TAPE MTA0:
                INTERCHANGE
                DENSITY 1600 or 800
                SKIP 3 (for KL-10) or 4 (for KI-10)
                RESTORE *.EXE, LIBOL.REL, COBDDT.REL, *.DOC, *.HLP
                REWIND
                EXIT

For COBOL-74
                R BACKUP
                TAPE MTA0:
                INTERCHANGE
                DENSITY 1600 or 800
                SKIP 5 (for KL-10) or 6 (for KI-10)
                RESTORE *.EXE, C74LIB.REL, *.DOC, *.HLP
                REWIND
                EXIT

For SORT - note that this will overwrite the previously restored LIBOL
and C74LIB with the new versions.
                R BACKUP
                TAPE MTA0:
                INTERCHANGE
                DENSITY 1600 or 800
                SKIP 7 (for KL-10) or 8 (for KI-10) or 9 (for KA-10)
                RESTORE *.EXE, *.REL, *.DOC, *.HLP
                REWIND
COBOL-68/74 V12A INSTALLATION GUIDE                             Page 9


                EXIT


The entire installation can  then  be  accomplished  with  three  COPY
commands of the general form:

     .COPY SYS: = *.EXE, COBDDT.REL, LIBOL.REL,  C74LIB.REL
     .COPY DOC: = *.DOC
     .COPY HLP: = *.HLP

C.  To verify the installation procedure copy the file ACP010.LIB from
    the  COBOL-68-K*-BUILD  save  set  (to  test COBOL-68) or from the
    COBOL-74-K*-BUILD save set (to test COBOL-74) to a  scratch  area.
    Extract the master .CTL file with the commands:

                .R LIBARY
                *=ACP010
                *EXTRACT ACPMASCM,ACPMAS.CTL
                *^C

D.  Submit the .CTL file with the command:

                .SUBMIT ACPMAS

    If the file  ACP1.LOG  contains  no  errors  then  the  new  COBOL
    compiler installed on SYS:  can perform basic COBOL tasks.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 10


4.0  SYSTEM REBUILDING

This section details how to rebuild all or  part  of  the  COBOL-68/74
system  in  order to support DBMS-10, MCS-10, SORT, or for maintenance
purposes.

This tape contains common sources  for  both  COBOL-68  and  COBOL-74.
Which  version  is  generated  is  controlled  by  the  setting of two
mutually exclusive feature test switches in COBASM.  For COBOL-68  set
ANS68==1  and  ANS74==0.   For  COBOL-74  set  ANS68==0  and ANS74==1.
Although it is possible to build the two compilers in  the  same  area
(though  not  simultaneously)  it  is  recommended that separate build
areas be used and that the source  area  be  make  a  library  (device
LIB:).

To simplify the building task  BLDCBL.CTL  reads  the  COBOL.TEC  file
which  contains  definitions  of  all the logical names used.  If this
file exists BLDCBL uses it to modify all the CTL files to produce  CTM
files  which  it  then  submits.   This allows the installation to use
private  packs  and  different  disk  areas  for  the  build.   It  is
recommended  that  the  same  logical  names be used and that the user
should edit COBOL.TEC to contain appropriate definitions.

COBOL-68/74 version  12A  supports  the  following  user  installation
settable  feature  assembly  switches:   DEBUG,  DBMS, DBMS4, MCS, BIS
(KL-10 central  processor),  and  ONESEG  (single  segment  compiler).
Other  assembly  switches  are  supported  only  in  their distributed
position.  The default setting for  the  DBMS,  DBMS4,  MCS,  and  BIS
switches  is  ON  (1), and for DEBUG and ONESEG the default setting is
OFF (0).  This represents the standard default configuration.

The supported switches may be  turned  on  or  off  by  setting  their
symbols  equal  to  1 or 0 in the universal file COBASM and rebuilding
portions of the system according to the instructions in the  following
sections.   COBASM  is  the  assembly  switch  definition file for all
system components.  A symbol equal to 1 means  the  switch  is  on,  a
symbol equal to 0 means the switch is off.

Rebuilding requires that all of the distributed files be copied to the
appropriate  disk  areas.   If  a total rebuild is to be done then the
appropriate build area can be cleaned up by  deleting  all  LOG,  REL,
MAP, UNV, etc.  files leaving only the control files.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 11


4.1  Required System Software

In order to  rebuild  all  or  part  of  the  COBOL-68/74  system  the
following  standard system software is required, of the specified or a
later version.

     Software       Version
     --------       -------

     MACRO          53(1020)
     LINK           4(765)
     MAKLIB         2(20)
     UUOSYM.UNV     13A(406)

COBOL-68/74 Version 12A will run under all supported monitors as  will
programs compiled with COBOL-68/74 version 12A.  
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 12


4.2  Standard Configuration

The standard distributed configuration consists of  two  multi-segment
compilers  containing support for all DBMS-10 and MCS-10 syntax.  This
means that all of the reserved words for DBMS-10 and  MCS-10  will  be
present  in  the  standard  configuration  of COBOL-68/74 Version 12A.
This will eliminate  the  necessity  for  rebuilding  the  COBOL-68/74
compilers  to  get support for this unbundled component.  The standard
distributed configuration also consists of an object time system and a
series of utility routines.  The standard distributed configuration of
the object time system and of the utility routines  does  not  include
support for DBMS-10 or MCS-10.

In general it is not  necessary  to  rebuild  the  entire  COBOL-68/74
system  in  order to configure systems supporting unbundled components
or to make patches to the existing system.  The instructions for  each
component  specify  any  dependencies  upon  the state of other system
components in order that no more of the system need  be  rebuilt  than
necessary.  The only general restriction is that none of the component
building control files may  be  executed  concurrently  and  that  the
compiler and OTS must be built first or the .UNV files from a previous
build must be available for the other components.  The following is  a
list  of each component of the standard configuration.  The list is in
the order in which the control files  for  each  component  should  be
submitted  if  all  components  are  being  built.  The list shows the
actual SUBMIT command which should be used for each control file,  and
as  long as the user is aware of the dependencies described, the order
of submitting them is not critical.  If you should wish to  build  the
whole  system,  just submit the file BLDCBL.CTL which will then submit
all the other .CTL files in the correct order with dependency counts.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 13


To build COBOL-68 and/or COBOL-74:

A.  Mount the COBOL distribution tape on logical MTA0:


B.  Type the following commands:


LOGIN to the COBOL-SOURCE area
                     REWIND MTA0:
                     R BACKUP
                     TAPE MTA0:
                     DENSITY 1600 or 800
                     INTERCHANGE
                     SKIP 1
                     RESTORE *.*
                     REWIND
                     EXIT

LOGIN to the COBOL-68-BUILD area
                     REWIND MTA0:
                     R BACKUP
                     TAPE MTA0:
                     DENSITY 1600 or 800
                     INTERCHANGE
                     SKIP 3 (for KL-10) or 4 (for KI-10)
                     RESTORE *.*
                     REWIND
                     EXIT

LOGIN to the COBOL-74-BUILD area
                     REWIND MTA0:
                     R BACKUP
                     TAPE MTA0:
                     DENSITY 1600 or 800
                     INTERCHANGE
                     SKIP 5 (for KL-10) or 6 (for KI-10)
                     RESTORE *.*
                     REWIND
                     EXIT

LOGIN to the SORT-BUILD area
                     REWIND MTA0:
                     R BACKUP
                     TAPE MTA0:
                     DENSITY 1600 or 800
                     INTERCHANGE
                     SKIP 7 (for KL-10) or 8 (for KI-10) or 9 (for
KA-10)
                     RESTORE *.*
                     REWIND
                     EXIT
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 14


C.  LOGIN to the appropriate COBOL-68-K*-BUILD or COBOL-74-K*-BUILD.
    Modify COBOL.TEC, 
    DELETE *.LOG, then SUBMIT the required files.


     a.  The whole system
            SUBMIT BLDCBL.CTL

     b.  COMPILER
            SUBMIT COBOL.CTL/TIME:1:00:00/RESTART:YES
            Dependencies:  None

     c.  OTS
            SUBMIT LIBOL.CTL/TIME:0:30:00/RESTART:YES
            Dependencies:  None

     d.  COBDDT
            SUBMIT COBDDT.CTL
            Dependencies:  INTERM.UNV and COMUNI.UNV

     e.  ISAM
            SUBMIT ISAM.CTL

     f.  LIBARY
            SUBMIT LIBARY.CTL
            Dependencies:  None

     g.  RERUN
            SUBMIT RERUN.CTL
            Dependencies:  COMUNI.UNV, FTDEFS.UNV and LBLPRM.UNV


NOTE, there will be no SORT in the OTS built by this procedure. See
sec. 4.3.3 for instructions for installing SORT into the OTS.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 15


4.3  Non-Standard Configurations

The following sections  specify  what  rebuilding  of  the  system  is
required   in   order  to  produce  specialized  configurations.   The
instructions are divided by feature but they are easily combinable  to
provide  more  than  one of the capabilities.  Refer to the preceeding
section  for  specifics  when  instructed  to  rebuild   some   system
component.



4.3.1  DBMS

If you have a standard configuration Version 12A COBOL-68 or  COBOL-74
Compiler,  all  that  is  needed to complete support for DBMS-10 is to
follow these instructions:

     1.   Include a copy of LIBOL.REL and  LIBSHR.REL  (for  COBOL-68)
         and C74LIB.REL and C74SHR.REL (for COBOL-74) in the same disk
         area as the contents of the DBMS-10 distribution tape.

     2.  Refer to DBMS10.DOC for DBMS-10 installation instructions.

The standard configuration of the COBOL-68 and COBOL-74 compilers come
complete  with  support for DBMS-10 , however, the object time systems
will not have DBMS-10 support.  This makes it much easier  to  install
DBMS-10  later.   However,  it does increase the size of the compilers
slightly and increases the number of reserved words.  If  you  do  not
want  any  DBMS-10 support in the compilers, it is possible to rebuild
the compilers turning off the DBMS and DBMS4 switches.   This  can  be
accomplished in the following manner:

     a.  Copy  the  contents  of  the  COBOL  distribution  tape  into
         appropriate disk areas.

     b.  Modify the universal file "COBASM.MAC" to include the  symbol
         definition "DBMS==0".

     c.  Rebuild the COBOL-68/74 compilers.

If you later wish to reinstitute support for DBMS-10 in the compilers,
follow  steps  a  and  c,  making sure that the symbol "DBMS" does not
appear in the universal file "COBASM.MAC".
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 16


4.3.2  SORT

     a.  If COBOL-68, COBOL-74 and SORT are all being rebuilt  because
         of  major  changes  in  the  configuration,  then the correct
         procedure is to first submit BLDCBL.CTL for each compiler and
         when they are done, SORT.CTL.
         BLDCBL.CTL creates the files required by SORT.CTL to add  the
         SORT to LIBOL and C74OTS.
         On the other hand if a COBOL-68 or COBOL-74  OTS  exists  and
         only SORT has been modified then it is sufficient to run only
         SORT.CTL.
         Similarly  if  SORT  exists  and  COBOL-68/74  OTS  has  been
         modified  it  is  sufficient  to  run only LIBOL.CTL for each
         compiler.

     b.  SUBMIT SORT.CTL/TIME:0:30:00/RESTART:YES
         which will replace the dummy SORT module used  by  the  COBOL
         SORT  Verb  with  the  real  SORT  module.   It will generate
         modified versions of LIBOL.REL and C74LIB.REL.  It will  also
         build SORT.EXE which is the stand alone configuration.

     c.  Install the system in the normal fashion and in addition

             COPY SYS: = SORT.EXE
             COPY DOC: = SORT.DOC
             COPY HLP: = SORT.HLP



4.3.3  USER LIBOL ROUTINES

COBOL-68/74 includes a facility allowing installations  to  add  their
own  special purpose MACRO routines to LIBOL.REL and C74LIB.REL.  This
is accomplished via a dispatch routine, loaded with the  user  program
which  resolves  the  external  references  into  references to a user
dispatch table in the OTS.  For routines requiring low segment storage
there  is  a  user  dynamic  (indexed) low segment facility.  Refer to
USRDSP.MAC for complete instructions.

The user routines are added to LIBOL.REL and/or C74LIB.REL  after  all
other OTS rebuilding but before installation on SYS:.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 17


4.3.4  MCS

If you have the standard configuration compilers, it is not  necessary
to   rebuild   any  system  component,  simply  refer  to  the  MCS-10
distribution package for MCS-10 building and installation procedures.

The standard configuration of the compilers come complete with support
for  MCS-10.   This  makes  it  much  easier  to install MCS-10 later,
however, it does increase the  size  of  the  compilers  slightly  and
increases the number of reserved words.  If you do not want any MCS-10
support in the compilers, it is  possible  to  rebuild  the  compilers
turning off the MCS switch.  This can be accomplished in the following
manner:

     a.  Copy  the  contents  of  the  COBOL  distribution  tape  into
         appropriate disk area.

     b.  Modify the universal file "COBASM.MAC" to include the  symbol
         definition MCS==0.

     c.  Rebuild the COBOL-68/74 compilers.

If you later wish to reinstitute support for MCS-10 in the  compilers,
follow  steps a and c, making sure that the symbol MCS does not appear
in the universal file "COBASM.MAC".



4.3.5  KI-10 and KA-10 Processor Configuration

The compilers and OTSs  can  be  reconfigured  to  not  generate  KL10
Central  Processor extended instructions and thus to run on a KI-10 or
KA-10 cpu.

     a.  Modify the universal file COBASM.MAC to  include  the  symbol
         definition "BIS==0".

     b.  Rebuild the compilers.

     c.  Rebuild the OTSs.

     d.  Refer  to   section   3   for   COBOL   system   installation
         instructions.


4.3.6  Single Segment Compiler

It is possible to build a single segment compiler.  The compiler  will
require 110K to compile a minimal COBOL program.

     a.  Modify  COBASM.MAC   to   include   the   symbol   definition
         "ONESEG==1".

     b.  Rebuild the COBOL-68/74 compilers.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 18


     c.  This will produce two single segment compilers consisting  of
         the files COBOL.EXE and CBL74.EXE which can be copied to SYS:
         instead of the multi-segment compiler configurations.

     d.  The remainder of  the  system  is  installed  in  the  normal
         fashion.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 19


4.4  COMPUTE Statement

The standard configuration (and all previous versions) of the compiler
uses   single  precision  floating  point  whenever  the  intermediate
temporary exceedes 18 digits or whenever exponentiation is used.  This
means  that  most  of  the  precision  is  lost.  The solution to this
problem is to use double precision floating point.  This has been done
for the KL cpu and most of the code to use this new internal data type
is always assembled.  However the data type is only invoked from a few
places  and these places have been put under a new feature test switch
BISCMP which is OFF in the standard  configuration.   The  reason  for
this  is  that the code has not been sufficiently tested and we do not
want to risk breaking many working programs for the few that need  the
new  code.   All  that  has  to  be  done  to support double precision
floating point is to define BISCMP==1 in COBASM.MAC  and  rebuild  the
compiler.   Infact  all  that  really has to be reassembled is COBASM,
INTERM, P,  EXPGEN,  MATGEN,  MOVGEN,  and  EXPGEN.   BISCMP  will  be
supported  both  ON and OFF, that is, we will fix any bugs reported in
the new COMPUTE code.  Note this code will not run on KA-10s since  it
uses  double precision floating point hardware, and it will not run on
KI-10s since it uses DADD instructions.

4.5.  I/O Performance Metering (LSTATS)

     a.  Read IOPERF.MEM to understand the project and what  you  have
         to do.

     b.  Build an LSTATS output area and use CRELD to create the  file
         LSTATS.DIR  (the method for doing this is documented fully in
         CRELD.DOC).

     c.  If you are running 6.03A please  install  the  monitor  patch
         RUNTIM.DDT  which  is  on the DOCUMENTATION area.  This patch
         will fix the RUNTIM UUO to return the correct runtime for the
         job  doing  the  UUO,  otherwise it could be off by up to one
         clock tick (1/60 second).  Note, this patch is not applicable
         to 7.00.

         After you have installed the LSTATS support in  your  system,
         you  can  rebuild LIBOL with the feature test switch "LSTATS"
         set to 1 (or just use the .EXE files supplied on the tape, if
         all  defaults  suit you).  This completes the installation of
         an LSTATS LIBOL.
COBOL-68/74 V12A INSTALLATION GUIDE                            Page 20


5.0  COMPATABILITY OF COBOL-68 AND COBOL-74

     a.  In general COBOL-68 will not compile  COBOL-74  programs  and
         COBOL-74   will  not  compile  COBOL-68  programs.   For  the
         differences between COBOL-68 and COBOL-74 see :
         American National Standard COBOL ANSI X3.23-1974
         pages X1V-10 through X1V-32.
         or
         COBOL-74 Language Manual AA-5059A-TK
         APPENDIX A

     b.  It is not possible to mix REL files produced by COBOL-68  and
         COBOL-74.

     c.  Data files - COBOL-68 and COBOL-74 are compatible.



[END of COBOL.INS]