Game Boy Camera w/ Propeller

Pokey V2.0 is equipped with a Game Boy Camera (a Mitsubishi M64282FP grayscale, edge-detecting wonder). The camera is interfaced to an Ardweeny from Solarbotics.  It's slow. Really, really slow.

So I thought hey, why not take this Propeller Schmartboard that's been collecting dust and see if I can drive (a) a fast ADC and (b) the Mitsu camera at a frame rate much greater than 3fps.

I've completed interfacing with an ADS7888 1.25 MSPS, serial-based ADC, running around 700 MSPS with some code tuning. That should be enough to run the camera, capture frames, and do some really simple image processing with the other cogs. I must say that Propeller Assembly is really easy and the deterministic timing and parallel operation of the cogs is just awesome to work with.

Meanwhile the Game Boy interfacing isn't going so well. I thought I had it all nailed. I've been checking and doublechecking with my scope and logic analyzer and then plugged in the camera and it hangs after capturing a frame.  My fear is that the Propeller 3.3V logic signals aren't playing nice with the 5V camera, even though the datasheet says it should be ok.

I made a simple level shifter for the clock using a couple of 2N4401's and some resistors, suspecting that the clock was the central issue, but it made absolutely no difference. So I'm at an impasse...

Whenever I'm at such a roadblock, I usually have to let the problem soak in my brain for awhile and eventually a solution--or at least something to try--pops into my head.  I learned that it's not worth working on the problem any further until I have something solid to try.

I guess I can go play with a 1-axis gyro in the meanwhile.