Well, I sure wish I could beat that by my own code, but I couldn't even come close. I can improve on yours though. First of all: in a golf, you needn't use my and pre-declare variables. Second, I don't understand the need for this statement: 
$_=join'',map{"$_\n"}@l[0,1,1,2,3,3,4];

[download]
Why not just use this 
$_=join$/,@l[0,1,1,2,3,3,4];

[download]
Well, here's your improved code, it checks in at 223 chars: 
sub f{
@c=qw[00700 00001 00000 75557 11111 71747
71717 55711 74717 74757 71111 75757 75717];
map{$l[$i++%5].=join'',(unpack("B8",chr)=~/(...)$/)[0,1,1,2],$"}
map{split//,$c[ord($_)-45]}split//,pop;
$_=join$/,@l[0,1,1..4];
tr/01/ X/;$_
}

[download]


The 15 year old, freshman programmer,
Stephen Rawls

In reply to Re: (Golf) LED Sign by srawls
in thread (Golf) LED Sign by tadman

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.