Informorph

Infomorphs are digital-only forms—they lack a physical body. Infomorphs are sometimes carried by other characters instead of (or in addition to) a muse in a ghostrider module.
Enhancements: Mnemonic Augmentation
Aptitude Maximum: 40
Speed Modifier: +2
Disadvantages: No physical form
CP Cost: 0
Credit Cost: 0

Eidolons

The basic infomorph shell is a software mind-emulation package that runs an ego. The default infomorph is much like a digital version of a flat, in that it does not enjoy the cognitive or other aptitude bonuses common to other physical morphs. Other varieties of infomorph shells exist, however. Known as eidolons, these digital morphs include routines that bolster an ego’s innate capabilities and often come equipped with pre-installed plug-ins and upgrades. Eidolons follow all of the normal rules for infomorphs, except as noted here.

When an ego is uploaded, it can choose to run on an eidolon instead of the standard infomorph shell. The eidolon software must be purchased or otherwise acquired, just like an infomorph or any other morph. Integration, Alienation, and Continuity Tests are called for, just as with a physical resleeving. Because the ego is mapped and formatted to the particular eidolon, if the ego is copied or forked to a basic infomorph or other eidolon, another set of Integration, Alienation, and Continuity Tests must be made.
Note that eidolons, like basic infomorphs, are software emulations of the hardware used by cyberbrains. Characters in physical morphs with cyberbrains cannot make use of eidolons because the eidolon is discarded when the ego is loaded onto the cyberbrain hardware.
While alpha forks can be installed in eidolons, neither beta forks nor AIs have the full potential to make use of an eidolon’s capabilities.