Signal Edge Detector - TIS-100

Here is my solution for Signal Edge Detector in TIS-100 (317/4/16):

The task is to detect if the previous input has a difference of 10 or more with the current one. You have to implement an absolute function to deal with negative numbers (e.g.: 80 - 90 = -10;). Then you subtract 10 from the difference and see if it is less than 0, in which case you output a 0 otherwise a 1. Register are pretty limited in TIS-100 so I use the first node to store the number and fetch it twice. The BAK register do not support ADD or SUB so it is not helping here. One thing I would like to try is to parallelize the code in 2 branches and reconcile the output in the last node with the ANY opcode...