Hi. For years, I am looking for details about: IO.sys logo compression. Now, it seems to be that Tihiy could have the solution. Comparing Tihiy's reduced io.sys with the original io.sys there are following differences: a.) Different header b.) differences at: 0x136C2, 0x136D5, 0x136D6 c.) additional data at 0x1E010 inside the original io.sys. At 0x1E010 there are following bytes: 7D8C0020445300000A6D8A0B6F400081B549C0288AA100813C0A0221862270C4 C094B80009618C0863334420FD090A10415080108202C410146088A000530405 182328C01C41010A090A50495080528202D41214E09AA000E70405B827282002 410171080AA84450402D8202EA11149093A080DE040574273802991B838C0D43 Is 7D 8C 00 20 ... a header for a Microsoft compression format (ms cab, ms compress/expand, lz77, lzxx)? Is the splash screen / logo inside the original io.sys compressed at all? How to extract/uncompress the logo data in Win95/98/ME's io.sys?
