Hey, remember when all the Sega systems were code-named after planets? I'm still trying to remember which was which:
Venus: Master System/Game Gear
Earth: Genesis (?)
Moon: Nomad (?)
Mars: 32X
Jupiter: cart based 32 bit system a.k.a. Giga Drive
Saturn: the CD based 32 but system what we know, also previously referred to as Giga Drive (hey, remember when the Saturn was going to be a cart/CD combo system?)
Neptune: the all in one Genesis/32X a.k.a. the Super Genesis that EGM mentioned
Uranus; ???
Pluto: ???
I'm still trying to figure out where (or if) the Sega CD falls into place.
And one more thing, anybody remember the Tera Drive? Wasn't it referenced in SEGAGAGA?
Venus - Sega Nomad (portable Genesis)
Earth - no idea if it was official. all i've seen is what you said, Genesis was codenamed Earth. but I dont actually believe that. edit: according to the SegaBase article on Genesis/MD, the MegaDrive was codenamed MK-1601
http://www.goodcowfilms.com/farm/games/segabase_archives/SegaBase - Genesis & MegaDrive.htm
Moon - nothing. Nomad was Venus
the GameGear was codenamed MicroDrive according to EGM.
no idea what the Master System was named, other than its Japanese variant, the Mark III.
TeraDrive - consumer name for the IBM PC + MegaDrive combo. the IBM PC side of TeraDrive was either an Intel 286 or the CPU that came before the 286.
Mars - 32X, yes.
Jupiter - cart based Saturn, yes. the Jupiter, Saturn and probably Mars/32X all have roots in the GigaDrive. the GigaDrive was circa 1990-1992, based on the System 32 board. the Mars/32X, Jupiter and Saturn were all heavily upgraded/changed from GigaDrive, but still probably have some GigaDrive DNA (the Video Display Processors probably) edit: I mean the way Sega's VDP technology works, not that Saturn/Jupiter and 32X have the exact same VDPs as the System 32 board and GigaDrive.
Saturn - right on, what you said
Neptune - Genesis combined with 32X, yes
Uranus - the Sega Butt System. j/k
Pluto and Mercury - both alledgedly were '64-Bit' systems. both based on Lockheed Martin Real3D graphics technology and probably PowerPC CPUs. one was an upgrade for Saturn. I forget which name was for the upgrade, either Mercury or Pluto. the upgrade was probably where the rumored '64X' or 'Eclipse' came from. And probably, the infamous VF3 3D upgrade cart is the same thing. the Real3D-based Saturn upgrade was probably in the same class as 3DO M2 or slightly above it. about 3 to 4 times more powerful than N64. Also more powerful than Sega's Model 2 board, but alot less powerful than the Model 3.
The other Real3D based Sega machine, either Pluto or Mercury, would be a totally seperate and more powerful console (more powerful than Saturn with upgrade addon) of Dreamcast class, more or less. Mercury and Pluto, one and upgrade and one a new console, both being LM Real3D based, was according to EGM and maybe some other magazines. circa 1996. this pre-dates the revelation of non-Real3D based machines, the 3Dfx BlackBelt and PowerVR Dural, of 1997.
Next Generation magazine had reported similar things to what EGM had. but only one would be released. either a Real3D based upgrade for Saturn, or a totally standalone Real3D based console. Next Generation called both machines 'Saturn2'. this was in 1995. So this was somewhat unlike what EGM a year or so later. EGM said the LM Real3D based Saturn upgrade AND LM Real3D based standalone console would *both* come out, and both had different names. whereas Next Generation reported them under the same name, Saturn2, and said one or the other would be released.
edit: another angle on the Saturn upgrade, '64X', and 'Eclipse....in 1995/1996 Sega was reported (pretty much confirmed) to have a deal with Matsushita to use the 3DO M2 as an upgrade for Saturn and/or a standalone console that Sega would make games for. but Sega decided the M2 was not impressive enough and walked away. the M2 was almost, but not quite, as powerful as the *lesser* of the two LM Real3D based '64-Bit' systems, the Saturn upgrade one (either Mercury or Pulto, aka Saturn2).