What are the real-life origins of CPU and CPU Candidates? In Hyperdimension Neptunia, Neptunia is based on Sega Neptune. The name of her country, Planeptune is obviously a reference to Sega Neptune. My question is, what console the other CPU and CPU Candidates (Nepgear, Noire, Uni, and Vert) are based on?

Noire means black and her country is Lastation which is based on Sony Playstation. But, PS2, PS3, and PS4 all has black color. PSX/PSOne is excluded since it's gray. Which Playstation console is she based on?

The same can be said about Vert, which means green. There are several variations of XBox. Which one is she based on?

And what about Nepgear and Uni?

EDIT: Considering that Blanc's sister are Rom and Ram, which is obviously a reference to ROM (Read-Only Memory) and RAM (Random Access Memory), it might be possible that Nepgear and Uni refers to a certain peripheral/component/parts of the console. But still, what part?
Nepgear is based on the Sega Game Gear, its reference being that Neptune wears two hairclips while Nepgear only has one, possibly representing the maximum number of D-pads supported by the respective consoles the two are based on. (The Sega Neptune is equipped with two controller ports, while the Sega Game Gear requires a link cable to play with more than one player.)

Noire does represent the PlayStation as "Noire" means "Black" in French, the default color of PS2, PS3, PSP and PSVita. Her HDD form in Neptunia Victory is based on the original PlayStation, her human forms seems to be based on PlayStation 2, and the yellow diamond on her outfit being a variation of the Sony Computer Entertainment logo (seen upon booting up PlayStations). In Neptunia Victory, all of her Processor Units are based on PS consoles: Her default (Stone Gray) is based on the original PlayStation, Night Blue is based on the PlayStation 2, DX Silver is based on the PlayStation 3 prototype, Piano Black is based on the PlayStation 3 and Orbital-S is based on the PlayStation 4.

Uni is based on the PlayStation Portable, probably with her name derived from the PSP's optimal disc, the Universal Media Disc.

Vert and Leanbox references the Xbox and Xbox 360, but there is no concrete hint to which they are. Although, in the first game, Vert was said to have a problem with getting too hot; this may reference the 360's tendency to overheat. The Green Heart's outfit is revealing, preferably to easier vent heat.

Ram and Rom are both based on the Nintendo DS. As they are twins, they could resemble the DS' dual screen. The rectangles on their hats in their default outfit seems to represent the screen icons from the DS logo.