The word "Emulator" can be seen on the back of one of Martin Gore's keyboards in this picture.

Robin Guthrie's use of the E-Mu Emulator I is confirmed in an article from One Two Testing (November 1984), titled "Coctale." Guthrie discusses the keyboard, noting, "The Emulator we were using was MIDI'd," which suggests that the original Emulator used was the midiless Emulator I, later upgraded to include MIDI functionality.

On the 1983 single Tour de France, a pre-production E-Mu Emulator sampler provided the Pentatonic Harp Glissando and Slap Bass sounds.

In this image, found on Vangelis' website, taken at Nemo Studios, one can see some the equipment used by Vangelis, including an E-Mu Emulator I.

Ryuichi Sakamoto used the E-Mu Emulator I during Yellow Magic Orchestra's winter 1981 tour, as shown in a user-uploaded photo on Geocities.

The lush pad on “P.Y.T.” (after Michael sings “I’ll take you there . . .”). It sounds multitracked, but really, it’s not. It’s a singletrack sample of Michael Jackson’s voice, done on an E-mu Emulator I — serial number 1, in fact! We then used this mode the Emulator had where you could sample the sound twice, then detune one of the voices while in “unison” mode. It was recorded with lots of top end added, and Bruce Swedien’s special reverb known as “spit.” Quincy Jones would say, “Sven, put some spit on it!”

"The [Yamaha] DX-7 as well. The DX-7 was more Invisible Touch where you get the much more percussive sort of sounds. Of course, the sampling instruments that started to come in. I started to use the [E-mu] Emulator III. I think that was Mama as well, as I think about it. We just sort of sampled everything around the place to see what sort of effects it had. I do think the instruments did affect the writing quite a bit. I do think when you go back and hear the sounds, I do love the sort of fat synths."

Source: http://www.worldofgenesis.com/TonyBanks-Interview2009-part2.htm

Stewart Copeland can be seen next to an Emulator I in this photo from Home Studio Recording magazine issue, published December 1983

Alan Wilder can be seen playing an E-Mu Emulator I sampler, as evidenced by an image showing him using the instrument. This sampler, introduced in 1981, was utilized by Depeche Mode starting with their album Construction Time Again and was also favored by band member Martin Gore.

"I will say that I'm constantly changing my rig, but the most common, long-lasting staples from the beginning that I have been using are the E-mu samplers, which I've been using since their very first E-I, the Macintosh, which I've used since the Jurassic version, and Mark of the Unicorn Performer, which I've used since its earliest incarnation. My extensive personal sample library of percussion is all laid out for the Emulators, but recently I began converting some of that library to use on the Gigastudio as well."

Stephen is playing an Emulator throughout this video.

Per this Feb 11, 2013 interview for The Guardian:

We'd bought ourselves an Emulator 1, an early sampler, and used it to add snatches of choir-like voices from Kraftwerk's album Radioactivity, as well as recordings of thunder.