Happy Halloween! 🎃
@__michaelg I add labels to those to prevent future damage.
@Peetz0r @__michaelg Are there still some of those around? Old Japanese electronics made in the 1980s sometimes had center negative. Are there modern laptops wired like that?

@mike805 @__michaelg This is an HP Onmibook from 1996.

But I have an Casio keyboard (CTK-481) that has a center negative barrel jack.

And a Brother labelmaker from 2017 that also has a center negative barrel jack.