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LINK.DOC: LINK Version 5.1(2030) 25 Jan 83
Copyright (C) 1983 Digital Equipment Corporation, Maynard,
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
LINK is the linking loader for the DECsystem-10 and
DECSYSTEM-20. LINK 5.1 is a maintenance release of LINK for
the DECSYSTEM-20 and a development release of LINK for the
DECsystem-10. LINK 5.1 includes a number of new features,
internal changes, and bug fixes.
LINK 5.1 supercedes all previous versions. It runs under
all supported monitors, and has been tested under TOPS-10
7.01A, and under TOPS-20 releases 4.1, 5.0 and 5.1.
LINK is documented in the LINK Reference Manual. This
manual is available as part of volume 4 of the TOPS-20
Software Notebooks, or it can be ordered separately as order
To install LINK, move the files LINK.EXE and OVRLAY.REL to
PS:<SUBSYS>. The LINK.HLP file should be moved to
3.0 REBUILDING LINK
All the files required to rebuild LINK are included on the
tape: sources, command files, and a control file. The
control file LINK.CTL reassembles the LINK and OVRLAY
modules and re-links LINK. It requires a time limit of 20
4.0 RECENT CHANGES AND NEW FEATURES
1. Users converting existing FORTRAN applications to
FORTRAN 77 as well as those writing new FORTRAN 77
programs will be able to use the load-time
typechecking facility in LINK. Use the /ERRORLEVEL
or /LOGLEVEL switch to get messages flagging
inconsistencies in the number and kind of arguments
being passed to a subroutine or function.
2. The /PLTTYP switch permits a user to specify
whether a spooled disk file should be plotter
format or printer format.
3. In LINK 5.0 a quota violation when writing .TMP or
.EXE files would cause LINK-20 to issue a fatal
non-continuable error message. In this new version
LINK-20 will try to expunge the directory in which
the output file is being written and continue after
the quota violation is detected. If this is not
possible the fatal message is issued.
1. If a program is being structured to use overlays
and there is a very large number of symbols
associated with a particular overlay link, LINK may
issue an ?LNKMEF memory expansion error if a map
file is requested. If this occurs use the switch
/NOLOCAL on some or all modules being loaded to cut
back the number of symbols.
2. LINK currently expects type 1120-1127 blocks to use
routine names that can be translated to SIXBIT and
which are unique in the first six characters. Also
this routine name must be a global symbol. Type
mismatch warnings also display only the first six
SIXBIT characters of the global symbol name. No
currently supported language is affected by this
3. The .TPLOD bit defined for the type 1120-1127
blocks is not currently used. No currently
supported language is affected by this deficiency.
4. There are conflicts between the documentation and
the implementation of type 1070 blocks:
Fullword addition is used for additive symbol
Right halfword addition is used for other additive
Fullword fixups are done when thirty-bit fixups are
No currently supported language is affected by
5. The .PVMEM word of the program data vector is not
6. Multiple program data vectors are not yet
7. LINK-20 ignores the /DEBUG:DDT and /TEST:DDT
switches when loading an extended addressing
program. Use the EXEC command DDT with the
/USE-SECTION switch to merge DDT into the program
8. Type 1070 blocks lose the section number of the
defining symbol during processing of 30-bit
9. There are inconsistencies in the usage of PSECT
indices in old and new .REL blocks.
10. .REL files cannot be read from non-directory
devices. This includes magtapes, cards and paper
tape. Transfer these files to disk before linking
11. FORTRAN Character-to-hollerith fixups do not
default the section number of the ASCIZ string when
extracting it from the Y field of the descriptor's
12. LINK does not flag 18-bit truncation of a 30-bit
value when doing a symbol table fixup or a polish
13. LINK does not type its exit messages when loading
an extended addressing program.