Looks like an interesting way round sourcing AC power bricks. Uses a 9-12V centre positive DC supply, I probably have a few in my stash of old tech I can’t bring my self to bin.
Boosts the input voltage to 15v then regulates it back down to 12. No 5v though but no great loss either as it seems little uses it.
Other than the boost board it’s a nice short bom.