A crack intro, also known as a cracktro, loader, or just intro, is a small introduction sequence added to cracked software. It aims to inform the user which "cracking crew" or individual cracker removed the software's copy protection and distributed the crack.
They first appeared on Apple II computer in the late 1970s or early 1980s, and then on ZX Spectrum, Commodore 64 and Amstrad CPC games that were distributed around the world via Bulletin Board Systems (BBSes) and floppy disk copying. Even the commercially available ISEPIC cartridge, which produced memory dumps of copy-protected Commodore 64 software, added a custom crack intro to the snapshots it produced. Early crack intros resemble graffiti in many ways, although they invaded the private sphere and not the public space.
As time went on, crack intros became a medium to demonstrate the purported superiority of a cracking group. Such intros grew very complex, sometimes exceeding the size and complexity of the software itself. Crack intros only became more sophisticated on more advanced systems such as the Commodore Amiga, Atari ST, and some IBM PC clone systems with sound cards. These intros feature big, colourful effects, music, and scrollers.
Cracking groups would use the intros not just to gain credit for cracking, but to advertise their BBSes, greet friends, and gain themselves recognition. Messages were frequently of a vulgar nature, and on some occasions made threats of violence against software companies or the members of some rival crack-group.
Crack-intro programming eventually became an art form in its own right, and people started coding intros without attaching them to a crack just to show off how well they could program. This practice evolved into the demoscene.
As of 2019, crack intros that use chiptunes live on in the form of background music for small programs intended to remove the software protection on commercial and shareware software that has limited or dumbed-down capabilities. Sometimes this is simply in the form of a program that generates a software package's serial number, usually referred to as a keygen. These chiptunes are now still accessible as downloadable musicdisks or musicpacks.
- Warez scene
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Amateur coders busy cracking the copy-protection on the latest Commodore 64 and ZX Spectrum games got into the habit of marking their work with an animated intro - or "cracktro" - inserted before the game began.
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As the demo scene established its independence, chiptunes were carried out of the gaming sphere altogether to finally establish their own stand-alone format: the downloadable musicdisk.
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- World of C64 Crackintros – A large collection of C64 cracktros in native "prg" file format (supported by most C64 emulators)
- Defacto2 – Hundreds of cracktros, loaders and installers for the PC
- Amiga Music Preservation – Thousands of cracktros in all tracker formats.
- Chiptune.com – A chiptune dedicated website containing thousands of chiptunes from Amiga and other formats. The website itself emulates the Amiga Workbench 1.3.
- THE AMIGA CRACKTRO MARATHRON – A large back-to-back collection of Amiga cracktros.