Virgil is one of the first Personality Cores
His design is based on the Aperture Science logo of the 70s, and is the only core that has a color that is not white.- Perhaps this is why he knows more about the old chambers compared to GLaDOS during the potato chapters.
AEGIS has some degree of sentience, or at least self-awareness.
The Stinger shows Chell waking up on AEGIS's display as his shutdown procedure completes. He knows he failed to destroy GLaDOS so he consciously wakes her up before he shuts down because he knows she can do the job.