In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:

This is late input, but I'll toss it out anyway: If you're concerned about noisy 12v inputs you could isolate them from the SX with an opto -- pretty clean and easy to do.  The other thing you should consider is fly-back diodes (e.g. 1N4001 - cathode to V+, anode to Vss) across your solenoids.
 

Just a note: Your NOS and SHIFT input circuits are different.  Are they supposed to be?

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