http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=LX_Iterated_Data_PageLX Iterated Data Page - Revision history2026-10-03T12:48:00ZRevision history for this page on the wikiMediaWiki 1.19.2http://fileformats.archiveteam.org/index.php?title=LX_Iterated_Data_Page&diff=52106&oldid=prevJsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Compression }} '''LX Iterated Data Page''' (correct name unknown) is a compression scheme sometimes used to compress parts of an [[..."2026-10-02T15:21:41Z<p>Created page with "{{FormatInfo |formattype=electronic |subcat=Compression }} '''LX Iterated Data Page''' (correct name unknown) is a compression scheme sometimes used to compress parts of an [[..."</p>
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'''LX Iterated Data Page''' (correct name unknown) is a compression scheme sometimes used to compress parts of an [[Linear Executable|LX]] (OS/2) executable file. It's usually non-executable resources that are compressed, not executable code.<br />
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The decompression is done by the OS/2 loader.<br />
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The compression may be requested via the linker option <code>/EXEPACK</code> or <code>/EXEPACK:1</code><ref>https://www.os2.kr/komh/os2books/os2tk45/toolsref/156_L4_ExepackE.html</ref>. So, it might sometimes be referred to as "EXEPACK" or "EXEPACK:1" or "EXEPACK1" compression, though it's not related to Microsoft's common [[EXEPACK]] compressor.<br />
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See also the successor [[EXEPACK2]].<br />
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== Format details ==<br />
The compression scheme is a kind of [[Run-length encoding|RLE]]. Not just single bytes, but also multi-byte patterns can be repeated.<br />
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== Specifications ==<br />
* [https://www.edm2.com/index.php/LX_-_Linear_eXecutable_Module_Format_Description#Iterated_Data_Pages LX Module Format Description], "Iterated Data Pages"<br />
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== Sample files ==<br />
(LX files that have some compressed pages)<br />
* {{CdTextfiles|hobbesos2/2_X/GAMES/DCHESS.ZIP|DCHESS.ZIP}} → *.EXE<br />
* {{CdTextfiles|nightowl/nopv17/044A/PGMG035.ZIP|PGMG035.ZIP}} → *.EXE<br />
* {{DiscMasterLink|view/41006/devcon-05-cd1.iso/os2se21/disk_10/sysmono.bmp/OS2/DLL/SYSMONO.FON|SYSMONO.FON}}<br />
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== References ==<br />
<references /><br />
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[[Category:Executable compression]]<br />
[[Category:OS/2]]</div>Jsummers