UPDATE# WIDE SCREENS AND HORIZONTAL SCROLLING

As explained in "Using MS-DOS Kermit", Kermit changes between 80 and 132
column mode upon host request (CSI ? 3 h / l) or when you give an explicit SET
TERMINAL WIDTH { 80, 132 } command.  Until now, 132-column screens were
possible only on PCs with video adapters that provide a 132-column text mode.
As of version 3.13, MS-DOS Kermit also includes support for DEC VT 132-column
mode and Data General compressed text on EGA and VGA video adapters, which do
not provide 132 columns in text mode, by entering graphics mode and writing
the characters dot-by-dot. 128 columns are displayed rather than 132 due to
the PC's screen geometry but you can use MS-DOS Kermit 3.13's new horizontal
scrolling feature to see the rightmost 4 columns (see below).

Normally, Kermit only keeps 80 columns in its screen-rollback memory.  If you
want to be able to roll back screens of 132 (or, for DG terminal emulation,
up to 207) columns, you must set the KERMIT environment variable WIDTH to 132
(or the desired number) in your AUTOEXEC.BAT file, for example:

  SET KERMIT=WIDTH 132

The KERMIT environment variable must contain a WIDTH definition before you
start MS-DOS Kermit in order for it to take effect.

NOTE: The KERMIT=WIDTH value and SET TERMINAL WIDTH value are two different
things.	 The former controls memory allocation in the rollback buffer, the
latter controls the actual display width (virtual or real) of your screen.

You can specify whether Kermit should use text (fast) or graphics (slow) mode
for compressed text with the new command:

  SET TERMINAL COMPRESSED-TEXT { GRAPHICS, TEXT }

Text mode will not actually display compressed text unless your video adapter
supports this function (see below), but Kermit's virtual screen is adjusted to
the terminal-emulation width.  For example, if your screen shows 80 characters
per line, but your terminal width is 132, then wrapping occurs at column 132
(perhaps off the screen) rather than column 80, and Kermit reports its screen
width as 132 (e.g. in response to a report-request escape sequence).

If your logical screen width is greater than the physical screen width, MS-DOS
Kermit 3.13 lets you scroll the screen horizontally by pushing keys.  The new
keyboard verbs are:

  \Klfpage    Scroll left one "page" (= 20 columns) (screen moves right)
  \Klfone     Scroll left one column
  \Krtpage    Scroll right one page (screen moves left)
  \Krtone     Scroll right one column

These verbs are unassigned by default.	Here are the commands you could add to
your MSCUSTOM.INI file if you wanted to assign them to the gray (T-pad) arrow
keys on the extended (101) PC keyboard:

  SET KEY \4427 \Krtpage  ; Left arrow makes screen move left on page
  SET KEY \5491 \Krtone	  ; Ctrl-Left arrow moves screen one column to left
  SET KEY \4429 \Klfpage  ; Right arrow makes screen move right one page  
  SET KEY \5492 \Klfone	  ; Ctrl-Right arrow moves screen one column right

When these keys are used in combination with the PageUp/Down keys, your screen
becomes a "virtual window" on your session, which you can move around in
arbitrary directions.

By analogy with SET TERMINAL ROLLBACK { ON, OFF }, which tells Kermit whether
to move a rolled-back screen automatically to the bottom when new characters
arrive from the host, the new command:

  SET TERMINAL HORIZONTAL-SCROLL { AUTOMATIC, MANUAL }

tells Kermit whether to scroll horizontally when a character arrives that
would be displayed to the left or right of the visible screen.	By default,
horizontal scrolling is MANUAL during VT terminal emulation, and AUTOMATIC
during DASHER emulation.  MANUAL means you have to push keys to scroll the
screen horizontally, AUTOMATIC means that Kermit moves the screen to "catch"
incoming characters.

Of course, for 132-column operation, it is always better if your video adapter
supports 132 columns directly -- the video board does all the work, which is
much faster than writing screen dots in software!  This works if Kermit knows
which kind of video adapter you have (Kermit determines this from a hopefully
unique "signature" in the video BIOS) and it knows how to set the desired
video modes.  Here is a list of such boards:

  ATI EGA and VGA Wonder
  AST, Dell, and other boards based on Western Digital VGA boards
  AT&T / Olivetti
  Everex Viewpoint EV-659, FVGA-673, EV-678, Micro Enhancer Deluxe
  IBM SVGA (= Tseng ET4000, e.g. on PS/ValuePoint)
  IBM XGA
  Paradise AutoSwitch EGA Mono
  Paradise Professional
  Paradise VGA Plus 16 (ROM BIOS 003056-xxx firmware)
  Paradise VGA Plus (ROM BIOS 003056-xxx firmware)
  Paradise VGA Professional (ROM BIOS 003056-xxx firmware)
  Paradise VGA1024
  STB VGA/EM (Tseng TVGA)
  STB VGA/EM Plus (Tseng 4000), VGA/EM-16, VGA/EM-16 Plus
  Tseng Labs EVA board with 132-column kit installed
  Tseng Labs UltraPAK mono/Hercules with 132 column modes
  Tseng Labs ET4000 SVGA
  VESA-compatible video BIOS
  Video 7 Vega Deluxe with 132X25.COM driver installed and Video 7 VGA

If you have an adapter capable of 132-column operation, but Kermit does not
know how to activate it, set up your COLS132.BAT and COLS80.BAT files to do
the switching, as described in "Using MS-DOS Kermit".

For Data General DASHER terminal emulation, screen widths up to 207 are
supported for purposes of horizontal scrolling, but no more than 128 can be
shown across the screen at a time.  DG terminal emulation is in text mode by
default.  As soon as the host commands the terminal to display compressed
text, Kermit switches the entire screen to 132-column text mode if your video
adapter supports it, and otherwise switches to (slower) graphics mode.	As in
VT terminal emulation, this behavior is controlled by the SET TERMINAL
COMPRESSED-TEXT command.  Unlike VT terminals, DASHER terminals (and MS-DOS
Kermit, when in graphics mode) can display compressed and regular text on the
screen at the same time.


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