Wow! I never knew this before.

Getting 100 characters high instead of 25 is the hard part; apparently there's a little-known byte you can tweak someplace to change the character cell height. This is of little use normally, since with a height less than about 7 you could never read the text, so it's seldom mentioned or discussed, but there you go.

Indeed, because you can not change the font. However, that register must be set to 1 to get the normal graphics modes.

As the CGA adapter has 16_000 bytes of on-board ram, you have just enough for a 160x50 character text mode, so again this is possible. (I should have done the calculation before: if CGA supported it as native graphics mode, the resolution could have been 320x100 so as to fill all the available memory.)

Also I guess you have to turn off blinking so that you can have all 16 colors as background, but CGA does have this feature.

Indeed, now that I re-read this manual (yes, I am cheating), I've found this note on the page describing the mode register: "The low resolution (160 by 100) mode requires special programming and is set up as the 40 by 25 alphanumeric mode."

In reply to Re^2: When I count, I think of numbers as... by ambrus
in thread When I count, I think of numbers as... by ambrus

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.