[quote name='Theenternal']Like some older model 1's U.S systems have Mega Drive written on it.[/quote]
The Mega Drive is an import. A lot of those found their way to the states for some reason.
Anyways, here's some info on the Genesis, which I originally posted in
this thread.
Here's what each model looks like (with apologies to you 56k users):
Model 1
Model 2, a little slimmer than model 1. No headphone jack, though.
Here's Model 3, a lot smaller than models 1 and 2. It also has a wider cart slot for playing imports.
And for those who have never seen it and wonder how the 32X and Sega CD connected to the Genesis, here's a model 2 with those hooked up. The Sega CD is a model 2.
And here's a Model 1 connected to the model 1 Sega CD (with the sliding disc tray).
And here's more info on the model 3, from
Digital Press:
This was the third model of the console, even smaller than the Genesis 2. It's significantly different than the first two models in other areas as well. You cannot connect a Sega CD to it as the expansion port has been removed. Because it lacks the Z80 processor found in the previous models, it is incompatible with the Power Base Converter (which allows it to play Master System games), a Game Genie, or several other more advanced Genesis titles like Virtua Racing. You can, however, plug a Mega Drive cartridge into it without a converter though if the cart has a lockout you're still out of luck.