The collection of useful addresses I've found for Barnstorming. The Notes field are mostly my best guesses at what they are.
SystemID A26
54 b u 0 Main RAM Accel
4D b u 0 Main RAM Engine Noise
56 b h 0 Main RAM Speed
6C b h 0 Main RAM Screen position?
68 b u 0 Main RAM XPos
60 b u 0 Main RAM X sub: 256 max
5A b u 0 Main RAM X sub: 16 max
72 b u 0 Main RAM X sub: 64 max
04 b h 0 Main RAM Ascend/Descend
55 b h 0 Main RAM Vspd
50 b h 0 Main RAM
4B b h 0 Main RAM 1F - accel?
0F b h 0 Main RAM YPos
58 b h 0 Main RAM X pix Vel
57 b h 0 Main RAM Y pix Vel
75 b h 0 Main RAM
5D b u 0 Main RAM XPos??
04 b h 0 Main RAM Inputs Mask