That was wyleyc. See this page: http://atariage.com/...r-order/page-58
(I was made aware of this thread via a PM -- thanks!)
Real life got *very* busy (I'm an engineer at a large fruit company) and I ended up being in China for most of last year.
The project was on hold for the duration, and I sort of figured that nobody was interested anymore because Eduardo was back and shipping product.
Having just logged into AtariAge for the first time in half a year, I see that's not the case.
... I'll reactivate the project as time permits over Q1 -- I have a couple of real-life things on my plate, but I should finish what I stated. I don't have anything worth publishing at the moment, as I repurposed the breadboard for a work project a few months back.
For those that are impatient and capable of building your own, the RAM portion is identical to the ADAM expansion module and the audio interface was taken directly from a (Spectravideo?) MSX schematic, with the address changed.
The ATMega can be replaced with a couple of flip-flops if you're interested in making your clone compatible with both the ColecoVision and the ADAM. I wouldn't bother, though ... for a Colecovision, wire it in for the full 32k RAM, use a flip-flop to toggle the ROM/RAM at 0000, and unconditionally map in the sound chip. For an ADAM, just map in the sound chip -- that's only three chips, plus a small audio amp.
There's nothing proprietary about the SGM, it's all off-the-shelf parts, and the design theory was borrowed (read: stolen) from prior art.
On a personal note: sorry for not checking in on this. Once Eduardo returned and started throwing tantrums about the mere possiblity of replicating his "proprietary" design, I figured that life was too short to bother with this scene and drama.