On my VGA machine I get something  useful for me: 

C:\>mode con lines=21

Mentioned in the mode /? page is „possible values depend on your hardware“. 
Does it make sense to try more values…? Or is there some rationale behind it?

Th.


> Am 19.06.2025 um 19:03 schrieb Eric Auer via Freedos-user 
> <freedos-user@lists.sourceforge.net>:
> 
> 
> Hi!
> 
>> How can I make the system font bigger?
>> (e.g. setting the display to 20 lines instead of 25)
>> I am using cga.
> 
> Hmm. CGA. Not even EGA or VGA. In VGA, you would get:
> 
> C:\>mode con lines=42
> Lines must be 25, 28, 43 or 50, or font size 8, 14 or 16.
> If you have VESA, 30, 34 or 60 lines can be available, too.
> 
> Given that CGA has 320x200 and 640x200 modes, you could
> try to load some 8x14 or 8x16 font, but that would mean
> only 12 or 14 lines.
> 
> In addition, the CGA BIOS does not contain fonts larger
> than 8x8, so you would have to use the DOS DISPLAY driver
> to load the larger fonts. However, that driver probably
> ALSO will assume that you only want 8x8 fonts and fail
> to load the larger fonts.
> 
> According to wikipedia, CGA only supports ROM fonts.
> I guess it just does not have enough graphics RAM.
> 
> You could only switch to a slow graphics mode and let
> the BIOS render the text in software. Should work for
> software which does not directly access text screen
> buffer memory and only uses DOS or BIOS to show text.
> 
> Regards, Eric
> 
> 
> 
> 
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