I've got a really, really ancient TurboPad that is different than any other I've come across. A recent discussion with The Old Rover rekindled my interest in this oddity, so I thought I'd share with the rest of you folks.
EXTERIOR DIFFERENCES:Note the obvious color differences. This one is weird. I'm not sure it was just a fluke, if it's a prototype, or what, but I've sure as hell never seen another one like it in the 18 years I've been involved with the Turbo.
OTHER DIFFERENCES:Note the difference in the color of the plastic for the D-pad, as well as the different texture. The "old" pad uses a completely smooth & shiny plastic, that is different in feel to that used on "normal" pads. Almost like it was from a different mold or something. The same go for the rest of the buttons.
INTERNAL DIFFERENCESMuch is different on the old pad: white rubber piece under the I/II buttons, an odd split rubber piece under the D-Pad, and almost all the rubber pieces have the anchor posts in different locations than that used on common "normal" pads.
PCB DIFFERENCES:I didn't do a comparison shot here, but you can see the "other" PCB in Old Rover's new thread. As you can see, this PCB is radically different than the one he pictured. Here's the other side: