updates
intermediate
updates
firmware bug?

test:

1. run 'E' -> X:3.8x (*)
2. R/S -> X:0.0
3. R/S -> X:97x (BUG)
4. R/S -> r12:95.4 (wrong, should be around 2.2)

(*) When running in SST from here, sometimes X: will receive 3.8x in test step 3.

Problem with the stack in the region 072-081?
prepare v0.2