E-Mu Systems formed in 1972 it appears as Dave Rossum and Scott Wedge built some desktop modular synths; 125 I read at the Emulator Archive page. (Thanks for busting all the links guys. lol) This is definitely the page for a broad range of information about E-mu gear and history if you can find it. I'm over trying to upkeep some of these links.
All user manuals appear to be on the site so I won't bother listing those..however if you go from the page above I noticed there are some dead links and newer stuff isn't there. Use The Emus link. For key replacement check my cross reference guide.
Emu Legacy gear docs
Patches for Morpheus.
Neil's ESI resource page. Patches and FAQ.
Parts Links:
Upgrades from Emulator archive