<div dir="ltr">These three box drawing diagonals appear in at least:<div>- Amstrad CPC</div><div>- Mattel Aquarius</div><div>- Atari 8-bit</div><div>- MSX</div><div>- PETSCII</div><div>- Kaypro</div><div>- Sharp MZ</div><div>- Ohio Scientific</div><div>- Robotron<br><div><br></div><div>See page 11 of: <a href="https://www.unicode.org/L2/L2019/19025-aux-LegacyComputingSources.pdf">https://www.unicode.org/L2/L2019/19025-aux-LegacyComputingSources.pdf</a><div><br></div><div>See page 5 of: <a href="https://www.unicode.org/L2/L2021/21235-terminals-supplement-sources.pdf">https://www.unicode.org/L2/L2021/21235-terminals-supplement-sources.pdf</a><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><br></div><div class="gmail_signature" data-smartmail="gmail_signature">They don't appear in Teletext.</div><div class="gmail_signature" data-smartmail="gmail_signature"><br></div><div class="gmail_signature" data-smartmail="gmail_signature">As to how they came to be in Unicode originally, I don't know. Probably some IBM or DEC character set.</div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><br>-- Rebecca Bettencourt</div></div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Mar 31, 2023 at 4:47 PM Kent Karlsson via Unicode <<a href="mailto:unicode@corp.unicode.org">unicode@corp.unicode.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">I don’t see them in any of the G2 character sets in <div><a href="https://www.etsi.org/deliver/etsi_en/300700_300799/300706/01.02.01_60/en_300706v010201p.pdf" target="_blank">https://www.etsi.org/deliver/etsi_en/300700_300799/300706/01.02.01_60/en_300706v010201p.pdf</a></div><div>(ETSI EN 300 706 V1.2.1 (2003-04)
European Standard (Telecommunications series)
<b>Enhanced <u>Teletext</u> specification</b>).</div><div><br></div><div>/Kent K<br><div><br><blockquote type="cite"><div>1 apr. 2023 kl. 01:26 skrev Doug Ewell via Unicode <<a href="mailto:unicode@corp.unicode.org" target="_blank">unicode@corp.unicode.org</a>>:</div><br><div>
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<div dir="auto">They are in at least the T.101-G2 set, used for teletext.</div>
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<div dir="auto">—Doug</div>
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<div id="m_7143927233931128008divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> Unicode <<a href="mailto:unicode-bounces@corp.unicode.org" target="_blank">unicode-bounces@corp.unicode.org</a>> on behalf of Manuel Strehl via Unicode <<a href="mailto:unicode@corp.unicode.org" target="_blank">unicode@corp.unicode.org</a>><br>
<b>Sent:</b> Friday, March 31, 2023 5:23:08 PM<br>
<b>To:</b> <a href="mailto:unicode@corp.unicode.org" target="_blank">unicode@corp.unicode.org</a> <<a href="mailto:unicode@corp.unicode.org" target="_blank">unicode@corp.unicode.org</a>><br>
<b>Subject:</b> Re: How do U+2571..U+2573 connect?</font>
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<div>Thanks for the answer! I almost thought that this was what’s going on.
<br>
From looking at the Wikipedia page, <br>
<a href="https://en.wikipedia.org/wiki/Box-drawing_character" target="_blank">https://en.wikipedia.org/wiki/Box-drawing_character</a>, it seems that those
<br>
three were not part of any larger legacy encoding. (The curved corners <br>
come from Acorn Computers by the way, acording to that article.)<br>
<br>
This leaves me wondering, where those three characters come from at all.<br>
<br>
Manuel<br>
<br>
Am 01.04.23 um 01:06 schrieb Asmus Freytag via Unicode:<br>
> The easy answer is that these do not consist of a single set. For <br>
> example, the single-, double-line regular-stroke symbols and their <br>
> combinations, form a subset that is supported by the DOS code page <br>
> 437. Another common DOS code page (850) has only the single-line ones.<br>
><br>
> Neither set contains any element that terminates in the middle of the <br>
> cell.<br>
><br>
> Those, as well as the heavy stroke or mixed weight combinations are <br>
> presumably supported somewhere else, as are the curved corners. I <br>
> don't know off hand what the character sets are from which these were <br>
> derived, but again, I would not be surprised if they supported only a <br>
> subset.<br>
><br>
> The diagonals, therefore, are not necessarily from any of those <br>
> subsets, and therefore likely never intended to be used to provide <br>
> diagonal connections.<br>
><br>
> A./<br>
><br>
><br>
> On 3/31/2023 3:46 PM, Manuel Strehl via Unicode wrote:<br>
>> Hi,<br>
>><br>
>> if you look at the Box Drawing block, e.g., <br>
>> <a href="https://codepoints.net/box_drawing" target="_blank">https://codepoints.net/box_drawing</a>, every character goes through the
<br>
>> middle of the edges of an imagined rectangle around the glyph. That <br>
>> is, apart from U+2571, U+2572 and U+2573, the diagonal lines. Those <br>
>> touch exclusively the corners of said rectangle.<br>
>><br>
>> I fail to imagine how these three characters could ever attach to any <br>
>> of the other characters in this block. Are they not meant to do that <br>
>> or am I missing a trick here?<br>
>><br>
>> Thanks for any pointers!<br>
>><br>
>> Cheers,<br>
>> Manuel<br>
>><br>
>> PS: This question was triggered by this reddit post: <br>
>> <a href="https://www.reddit.com/r/Unicode/comments/127y7dn/looking_for_box_drawing_characters/" target="_blank">
https://www.reddit.com/r/Unicode/comments/127y7dn/looking_for_box_drawing_characters/</a><br>
><br>
><br>
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