Bug Chain
Defeat either ShademanSP or LasermanSP without destroying the Green Mystery Data to obtain this giga-level chip.

Darkness Aura
S-Rank ForteSP, a random encounter in Black Earth 2 to obtain this chip.

Forte
Defeat Forte behind the Standard Gate in the Ura-Internet to obtain this chip.

Holy Dream
Bought from a Shop in Ura-Internet 4 for a whopping 100
BugFrags

Red Sun Ray
Talk to Yuuichiro at ANSA before the end of the game and he will give you this chip
Secret Boss
To get past the gate in Ura Internet area 5, you need all 150 regular chips. Once you get past it, you can fight the secret boss, Forte, and get his chip, Forte.

Secret Boss 2
After completing the Black Earth dungeon, exit (plug out) and re-enter. You can now encounter Forte SP in Black Earth area 2, and obtain Black Barrier from him.

Secret Dungeon
There is a large hole surrounded by purple slime on a platform in Ura Internet area 6. In order to approach it, you need the chips "Bug Charge", "Muramasa Blade", "Black Wing", "Element Dark" and "Poison Anubis". Once you get close enough, it will suck you down to the secret dungeon, Black Earth