I'm using an Arduino Uno, original 1.0
I'm using the TFT.h, TouchScreen.h and the examples which are included in the package found in the resources downloads on the wiki page for the device
http://www.seeedstudio.com/wiki/2.8''_TFT_Touch_Shield_V1.0#Resources
I haven't modified the code at all. I would post it here if I was at my computer.
I can't find A1 or A2 anywhere in the tft or touch screen libraries. I haven't checked the other libraries used by the sketches yet. I get the not declared part, buy I'm not sure what "in this scope" means.
I think the fundamental problem is that I'm using either outdated, incompatible, or insufficient code to interface a product primarily designed for seeeduino with arduino.