@YukoAsho  
Errr, I meant 10NES chip. :P

@Beau Skunky  
Well, I’m sure the ease at which piracy happened on the system didn’t have anything to do with it… ;) Seriously though, bootlegging in Asia had affected the western system in several ways, most notably the addition of the now infamous NES10 chip.

@YukoAsho  
Yeah, the NES had one on the bottom to, I think they cancelled the American version of the “Famicom Disc System,” because it became obsolete, once Nintendo figured out how to make NES/Famicom cartridges to hold more data.
 
In fact, some games such as Zelda 1 & 2, Metroid, Kid Icarus, SMB: Lost Levels, Castlevania, and others were all originally “Famicom Disc System” games, but were able to be redone on the NES regardless. (Though, with some slight changes to the sound quality.)
 
Interestingly, the 3DS version of “Kid Icarus,” (the “3D Classics” one) is the “Famicom Disc System” version, (so it has that version’s sound quality, and save files, without the USA password-continue system) but with some things from the American version put in to. (Like the “best” ending.)

@Kanrabat  
The Japanese SG-1000 Mark III (Their version of the Master System) had a peripheral that allowed for FM synthesis in supported games, as opposed to the normal PSG audio the system produced. While this was later integrated into the Japanese system when they got the western designed version, we never got FM synth support. There were about 40 games that supported FM synth, and they all sound better in FM than in the stock PSG.

@YukoAsho  
The Master System (western model 1) also had an unused expansion port which is nowadays used to mod the system for FM output.
 
Wait. What? Dafuk is that?

@Mokona  
Oh GOD, that fucking thing…. I’d totally forgotten about that.
 
@Background Pony #3B2A  
Yeah, most people probably never knew what the hell was under the systems. Made sense, as why would anyone look under there unless they were told to? Especially since, as @Beau Skunky mentioned, it was often obscured by plastic, leaving the system looking rather plain to a casual looker.
 
The Master System (western model 1) also had an unused expansion port which is nowadays used to mod the system for FM output. There were actually plans for a floppy drive for the system similar to Nintendo’s Famicom Disk System, but those plans never left the prototype stage.
 
@Background Pony #3B2A  
The modem was hilarious. Only ever really used for two games (PSO 1&2 and PSOIII). The GBA player was way more useful.

@Beau Skunky  
GameCube had like, 3 or 4. I figured one was for the modem and another for stuff like GBA player, not sure about the rest.

@YukoAsho  
Yeah, they’re that part underneath with the removable plastic door covering ’em. As a kid I wondered what they were for. They were meant for accessories that were never made. The N64 & GameCube had similar ports to on the bottom.

@YukoAsho  
The expansion port was also used by the “Exertainment” exercise bike accessory, if I remember correctly.

@YukoAsho  
I see, never noticed it on NES or SNES. The one on N64 I actually have been using with Doctor v64, a third party device that reads roms.

@Background Pony #3B2A  
There’s an expansion port on the underbelly of the system, much like the NES. It was used in Japan for the BS satellaview peripheral. A similar port was also on the N64, and once again only saw use in Japan, this time for the 64DD.

Does SNES even have a slot for attachments like this? Genesis had one on its side, the only slot SNES had is the one for cartridges, if I remember right.

Pinkie, you already casually violate space. Please show a little respect for time.

But I already have one…  
A model II even.

I’d be game for another Sonic CD if it had a similar soundtrack. Stardust Speedway present is my jam.
 
GET FUNKY  
KEY TO KEY  
GET FUNKY  
YO HUSTLE HUSTLE

Ah the nostalgia.
 
The irony is that Nintendo did try to make one in a partnership with Sony. Nintendo changed it’s mind and cancelled the progect mid-way through. We all know where that went.

@Beau Skunky  
And Sega is partly responsible for XBox and getting Microsoft into consoles, because MS helped them with designing Dreamcast’s OS.

Nintendo was going to make a CD add-on console for the SuperNES, (partnered with Philips & Sony before to make one) but after the Sega CD, and other similar ones eventually failed in the market, they backed-out. (Which lead to Philips creating the CD-I, and Sony to make the Playstation.)
 
So ironically Nintendo got Sony into making video game consoles, (said cancelled add-on they were making with Sony, eventually became the Playstation) so it’s very ironic when Sony-fanboys bash Nintendo.

@sirvancelot  
You should send it off to http://www.rapidfiregaming.net and get it fixed. I sent mine to him, and it works like a damned charm now.

I have a model one but it only works when it feels like it. :(