DECset
DIGITAL Language-Sensitive Editor/Source
Code Analyzer for OpenVMS Reference Manual
Appendix F
Providing 7-Bit Terminal Support for Code Elision
You can use the OpenVMS Terminal Fallback Facility (TFF) to resolve the
problem of VT100 terminals displaying unrecognizable characters in
place of the double-angle brackets («») displayed on VT200
terminals. The TFF translates the double-angle brackets to single-angle
brackets. Have your system manager use the following procedure:
- Enable TFF by including the following commands in the system
startup procedure SYS$MANAGER:SYSTARTUP_V5.COM:
$ @SYS$MANAGER:TFF$STARTUP.COM
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- Add the commands to load the default system fallback and compose
sequence tables to the file SYS$MANAGER:TFF$STARTUP.COM.
For
example, to load the necessary fallback and compose-sequence table for
use in North America, the system manager would add the following
commands:
$ RUN SYS$SYSTEM:TFU
SET LIBRARY SYS$SYSTEM:TFF$MASTER ! Define the library of tables
LOAD TABLE ASCII_OVST ! Load for hardcopy ASCII terminal
SET DEFAULT_TABLE ASCII ! Set default to ASCII
EXIT
$ EXIT
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After this has been done, you can use the fallback utility. To enable
terminal fallback, enter the following command:
From this point on terminal fallback is enabled. If you want to disable
terminal fallback, enter the following command:
$ SET TERMINAL/NOFALLBACK
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If the SOFT_COMPOSE feature is enabled, you must rebind the ERASE
PLACEHOLDER and UNERASE PLACEHOLDER keys to something other than
Ctrl/K. This is because Ctrl/K is reserved by TFF to signal the
initiation of a compose sequence. You might want to use the Ctrl/space
and GOLD-Ctrl/space key bindings, but this produces an ASCII NULL,
which might cause problems with some communications equipment. It is
recommended that SOFT_COMPOSE be disabled unless it is required.
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