Pg. of GC20-1819-2 Rev March 30, 1979 by Supp. SD23-9024-1 for 5748-XX8 PFnn is any valid function key from PF1 to PF24. n1 n2 ••• nn are the logical tab settings desired, expressed as
decimal numbers. Invalid tab settings are ignored. You can specify the setting values in any order, but they
are normally specified in ascending order. You can define different PF keys with different tab settings for
different filetypes. Whenever you press the PF key you have set for a
tab, the cursor moves to the corresponding position in the user input
area, in much the same way that a typing element on a typewriter would move to the next tab stop.
If you press the PF tab key to a position that already contains a
data character, the data remains intact. If there is no data in that
position, a tab character is entered in the file. The effect of the tab
in the file depends, as in normal usage, on the image setting of the
editor. If the image setting is set to on (the default), the tab expands
to an appropriate number of blanks, to correspond to the settings in
effect for the TABSET subcommand. When the TAESET settings match the
tab settings of the PF key, then any lines you enter in the user input
area appear exactly as they will appear in the output display area.
If you tab beyond the last defined tab position, the cursor is
repositioned at the beginning of the user input area. When you edit a file on a 3210 terminal in display mode, you should not
copy a line containing tabs or backspaces into the user input area. The
tabs or backsFaces are converted to blanks (X'40'). Similarly, if the
line contains VM/310 logical line editing symbols that have been entered
as data characters, the symbols are reinterpreted when you enter the
line.
If you use the SET OUTPUT function to display non printable characters
in CMS, the character translations do not appear when the editor is in
display mode. They are, however, displayed when the editor is in line
mode.
Using APL with a 3270 If you have a 3211 or 3278 display station equipped with an APL
keyboard, you can use APL on a 3210 terminal in CMS. You invoke the APL
virtual machine by issuing the command specified in the VSAPt Program Product documentation. This command invokes the VSAPL-CMS interface
program. You are then Frompted to press the APt On/Off key which is cn
your terminal; pressing this key changes the keyboard to APL character
input mode. You are then prompted to press the Enter key to continue. EBCDIC or APL characters can always be displayed; the APL Cn/Off key
does not change this. The VSAPL-CMS interface program issues the
TERMINAL APL ON command for you and selects the appropriate translation
tables. The TERMINAL APL ON command automatically fcrces a TERMINAL TEXT OFF condition. The interface program then invokes the VSAPL program. When the VSAPL ready message appears on the screen, you can
use APL. 350 IBM VM/310 CMS User's Guide

Pg. of GC20-1819-2 Rev 30, 1979 by Supp. SD23-9024-1 for 5748-XX8 You can send a copy of your display screen to a locally or remotely
attached printer. Be sure that the printer you send your output to has
the APt feature installed; if it does not, the APL characters are not
printed. Most system printers do not have an APt print chain; therefore
you may need to use the copy function to direct your screen output
displays to a 3284, 3286, or 3287 printer. ERROR SITUATIONS If you do not have the APt hardware feature installed on your 3277 or
3278 but you invoke APt: • The VSAPt program is invoked and the TERMINAL APt ON command is
issued. • You cannot communicate with the VSAPL program. • Any APt characters that are written to the screen appear as blanks.
If you have the APt feature installed on your terminal, but invoke APt manually without issuing the TERMINAL APt ON command or issue
TERMINAL APt OFF at sometime during APL processing: • The VSAPt program is activated. • You cannot communicate with the VSAPL program. • Any APt characters written to the screen appear as blanks.
If you to use the APL 0/5 (overstrike) key when the APt hardWare key is set off, it acts as a backtab key and repositions the cursor to the beginning of the user input area. LEAVING THE APL ENVIRONMENT Issue the APt command: ) OFF to log off 15/370. Issue the APt command:
) OFF HOtD to return to CMS. program, which:
This APt command invokes the interface • Issues the TERMINAt APt OFF co.mand • Prompts you to press the APt hardware key • Returns to CMS The APt hardware feature is a key, not a switch. Each time you
press the APt key you reverse its on/off setting. To determine whether APt is on or off, press a key that represents a special APL character.
If the character displayed is an APL character, the hardware APL feature
is set on. If the character displayed is a non-APL character, you must press the APt key once to set the APL feature on.
Appendix C: Considerations for 3270 D:.splay Terminal Users 351