(emacs.info) MS-DOS Display

 
 Display on MS-DOS
 =================
 
    Display on MS-DOS cannot use font variants, like bold or italic, but
 it does support multiple faces, each of which can specify a foreground
 and a background color.  Therefore, you can get the full functionality
 of Emacs packages that use fonts (such as `font-lock', Enriched Text
 mode, and others) by defining the relevant faces to use different
 Parameters::) and the `list-faces-display' command ( Faces) to
 see what colors and faces are available and what they look like.
 
    The section  MS-DOS and MULE, later in this chapter, describes
 how Emacs displays glyphs and characters which aren't supported by the
 native font built into the DOS display.
 
    Multiple frames ( Frames) are supported on MS-DOS, but they
 all overlap, so you only see a single frame at any given moment.  That
 single visible frame occupies the entire screen.  When you run Emacs
 from MS-Windows DOS box, you can make the visible frame smaller than
 the full screen, but Emacs still cannot display more than a single
 frame at a time.
 
    The `mode4350' command switches the display to 43 or 50 lines,
 depending on your hardware; the `mode25' command switches to the
 default 80x25 screen size.
 
    By default, Emacs only knows how to set screen sizes of 80 columns by
 25, 28, 35, 40, 43 or 50 rows.  However, if your video adapter has
 special video modes that will switch the display to other sizes, you can
 have Emacs support those too.  When you ask Emacs to switch the frame to
 N rows by M columns dimensions, it checks if there is a variable called
 `screen-dimensions-NxM', and if so, uses its value (which must be an
 integer) as the video mode to switch to.  (Emacs switches to that video
 mode by calling the BIOS `Set Video Mode' function with the value of
 `screen-dimensions-NxM' in the `AL' register.)  For example, suppose
 your adapter will switch to 66x80 dimensions when put into video mode
 85.  Then you can make Emacs support this screen size by putting the
 following into your `_emacs' file:
 
      (setq screen-dimensions-66x80 85)
 
    Since Emacs on MS-DOS can only set the frame size to specific
 supported dimensions, it cannot honor every possible frame resizing
 request.  When an unsupported size is requested, Emacs chooses the next
 larger supported size beyond the specified size.  For example, if you
 ask for 36x80 frame, you will get 40x80 instead.
 
    The variables `screen-dimensions-NxM' are used only when they
 exactly match the specified size; the search for the next larger
 supported size ignores them.  In the above example, even if your VGA
 supports 38x80 dimensions and you define a variable
 `screen-dimensions-38x80' with a suitable value, you will still get
 40x80 screen when you ask for a 36x80 frame.  If you want to get the
 38x80 size in this case, you can do it by setting the variable named
 `screen-dimensions-36x80' with the same video mode value as
 `screen-dimensions-38x80'.
 
    Changing frame dimensions on MS-DOS has the effect of changing all
 the other frames to the new dimensions.
Info Catalog
(emacs.info) MS-DOS Input
(emacs.info) MS-DOS
(emacs.info) MS-DOS File Names
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