http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=Uxn_program_file 2026-04-21T08:14:26Z Revision history for this page on the wiki MediaWiki 1.19.2 http://fileformats.archiveteam.org/index.php?title=Uxn_program_file&diff=48903&oldid=prev 2024-07-16T04:41:54Z

<p>Better explanation of the first byte of a uxn program file.</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 04:41, 16 July 2024</td> </tr><tr><td colspan="2" class="diff-lineno">Line 8:</td> <td colspan="2" class="diff-lineno">Line 8:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Identification ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Identification ==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Any </del>valid uxn <del class="diffchange diffchange-inline">file will </del>have the first byte being <del class="diffchange diffchange-inline">a nonzero multiple of thirty-two</del>, <del class="diffchange diffchange-inline">other than thirty-two itself</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">A uxn program can potentially have any sequence of bytes, since any sequence is </ins>valid <ins class="diffchange diffchange-inline">(there are no errors in </ins>uxn<ins class="diffchange diffchange-inline">). However, it is most likely to </ins>have the first byte being <ins class="diffchange diffchange-inline">0x40</ins>, <ins class="diffchange diffchange-inline">0x60, 0x80, 0xA0, 0xC0, or 0xE0; others are not very useful as the first byte (if it is 0x00 then the program won't do anything, and anything else will read data from the stack (will will be meaningless data if nothing has been pushed to the stack already))</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>A uxn file with metadata will have {{magic|A0 xx xx 80 06 37}} as the first six bytes, where the second and third bytes are a big-endian 16-bit address of the metadata (where the beginning of the file is address 0x0100).</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>A uxn file with metadata will have {{magic|A0 xx xx 80 06 37}} as the first six bytes, where the second and third bytes are a big-endian 16-bit address of the metadata (where the beginning of the file is address 0x0100).</div></td></tr> </table>

Zzo38 http://fileformats.archiveteam.org/index.php?title=Uxn_program_file&diff=44441&oldid=prev 2023-04-25T17:33:34Z

<p>Identification of file</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 17:33, 25 April 2023</td> </tr><tr><td colspan="2" class="diff-lineno">Line 6:</td> <td colspan="2" class="diff-lineno">Line 6:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>Uxn is a simple virtual machine. A Uxn program file is loaded into the virtual machine's memory starting at address 0x0100, and then execution starts at address 0x0100.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>Uxn is a simple virtual machine. A Uxn program file is loaded into the virtual machine's memory starting at address 0x0100, and then execution starts at address 0x0100.</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">== Identification ==</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Any valid uxn file will have the first byte being a nonzero multiple of thirty-two, other than thirty-two itself.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">A uxn file with metadata will have {{magic|A0 xx xx 80 06 37}} as the first six bytes, where the second and third bytes are a big-endian 16-bit address of the metadata (where the beginning of the file is address 0x0100).</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* https://wiki.xxiivv.com/site/uxn.html</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* https://wiki.xxiivv.com/site/uxn.html</div></td></tr> </table>

Zzo38 http://fileformats.archiveteam.org/index.php?title=Uxn_program_file&diff=43526&oldid=prev 2022-11-03T23:41:30Z

<p>Created page with &quot;{{FormatInfo |formattype=electronic |subcat=Executables |extensions={{ext|rom}} }} Uxn is a simple virtual machine. A Uxn program file is loaded into the virtual machine&#039;s me...&quot;</p> <p><b>New page</b></p><div>{{FormatInfo<br /> |formattype=electronic<br /> |subcat=Executables<br /> |extensions={{ext|rom}}<br /> }}<br /> <br /> Uxn is a simple virtual machine. A Uxn program file is loaded into the virtual machine's memory starting at address 0x0100, and then execution starts at address 0x0100.<br /> <br /> == Links ==<br /> * https://wiki.xxiivv.com/site/uxn.html</div>

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