Suggestion for turning this into one case structure

Question

This is a snippet from some exisiting code we were hired to modify/clean up. I have to assume there is some way I can reduce this to only have one case structure, maybe with a not-and or not-or. Or maybe I'm overthinking this. Basically I keep confusing myself in relatively simple code when thinking about the booleans being compared. Any help is appreciated.
CLA, LabVIEW Versions 2010-2013
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Answer 1

KathrynB wrote:
This does look to be just a NAND, pure and simple.
The truth table I came up with was:
old   new    write to global
0      0         1 (< is false, new is false)
0      1         1 (< is true)
1      0         1 (< is false, new is false)
1      1         0 (< is false, new is true)
Classic not-and.
Your logic works in the case where you want one result if both inputs are TRUE, and another result otherwise.  That would require modifying the original logic.  In the case where the original logic persists, then you need one result if one input is TRUE and the other is FALSE, and another result otherwise.  In this case, you need Implies.
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman