Cisco IOS download

Some of the Cisco IOS's, useful for GNS3 simulator

http://gns3.blogspot.com/2007/10/ios.html

http://startccna.blogspot.com/2012/11/download-cisco-ios-124.html

http://certs4u.info/ciscoios/2600XM%20Routers/Cisco%202600XM%2012.4T/

http://heiserz.com/2013/01/10/cisco-ios-collection-originally-internetwork-operating-system/


You can use command:
C:\"Unpack">unpack.exe --format IOS c2600-is-mz.122-46.bin
Where:
C:\UUNPACK is the path of the unpack tool that downloaded from GNS3 website