The display mode can be changed by using mode (rather unsurprisingly).
The syntax for using mode to set the display mode is:
mode <display adapter>
<display adapter> Can be chosen using this table:
For example use this for colour with 40 lines:
|bw40||Black and white with 40 lines.|
|bw80||Black and white with 80 lines.|
|co40||Colour with 40 lines.|
|co40||Colour with 80 lines.|
This is probably not very useful since there aren't that many uses
for these modes.
If however you have ANSI.SYS loaded (and suitable hardware), you have
more useful options at your disposal using this syntax:
mode con: cols=80 lines=25
You can use cols=40 should you want to change the number of characters
across the screen to 40 instead of 80 as shown in the example.
lines= is more useful because it allows you to change the number of
characters down the screen. 25, 43 and 50 are valid.
One final comment, although it is possible to use DOS
in graphics modes it's not advisable since it is very slow.