The ISEPIC ("Ice-pick"[1]) from Starpoint Software in USA is an extension cartridge introduced in June 1985 for the Commodore 64.
It offers the capability to memory dump software regardless of the implementation scheme or storage medium.
[2] Snapshots require ISEPIC to run, but can be modified to create standalone versions that do not need the cartridge.
ISEPIC creator Chip Gracey said that he sold 20,000 cartridges within one year, mostly through computer clubs and magazines.
While warning readers against violating copyright, the magazine discussed the cartridge's ability to both produce snapshots that require the cartridge to boot, and help users modify snapshots to produce standalone versions of programs ("In the tradition of the true hacker, these routines also display the Isepic logo while booting the program").