[Resources and documentation on the ColecoVision for emulation purposes?]

Hello there,

I have written multiple emulators for relatively complicated systems, and recently I decided to try writing one for a simpler device. I chose the ColecoVision. The problem is, I can't seem to find any good documentation or reference on the ColecoVision's hardware. I did manage to find programming tutorials and stuff on the hardware, but I'm preetty sure it won't be enough to make an emulator. 
Since this forum seems to have a lot off stuff about the coleco, I decided to ask here: Would anyone happen to know where one can find good references?

Thank you very much!