Today I noticed that CompUSA has the Mustek PF-A700B digitial photo frame for $70. So I got one on a flier thinking that I could hack it.
Turns out, that I doubt I could hack it. Here's why.
The unit has two CheerTEK parts in it. A CT-950A and a CT-978. These two are the display engine and "CPU" for the box. However, there's no documentation available on these parts, or prior parts in the same family. There appears to be only 16MB RAM and no ROM/flash chips I could find.
It is kind of a shame because the box has USB, CF and SD slots. One could imagine replacing the firmware that's inside it with firmware that did a wireless connection to a network drive to get the pictures off one folder. There's also two unpopulated headers. One looks like it is either serial or JTAG. The second one is for IIC control. These could make hacking on this box relatively easy, but the total lack of documentation makes doing anything with it a non-starter.
I hope others have better luck, but I'm returning mine. It is too wimpy a photo frame, and there's no way to bend it to my needs.