I restored a couple of color station boards yesterday and just realized they also use the same RTC as the turbo models. I'm not sure I've ever seen that documented. I think the color is often overlooked due to RAM limitations (both quantity and how picky it is), but as a result its one of the best entry points into the platform, especially since Rob recreated the 13W3 Y-cable. I notice some very curious variations between the layout of the revision A & B logic boards that I want to investigate. My Rev B actually has pins removed from the ceramic custom ASIC which I find interesting.
The color station is a nice machine. I've always liked the corner badge design. I don't know the differences between the A and B revision but I'm guessing the one I have is an A revision because it has had the plastic retaining clips on the RAM slots (a previous owner broke them all). It also has a socketed CPU.