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@penguin42@mastodon.org.uk
2026-10-22 13:17:06

Looking at Sun3 psu parts again, it seems to me that they were designed in negative - this little daughtercard makes it pretty obvious - they've not laid down tracks - they've down the gaps and ended up with sets of lands. The whole board is only a few cm across, so I don't think anything here is taking significant power.
#retrocomputing

The back of a small daighterboard PCB against a nice purple background. The PCB is the standard green tracks on a darker board; it's through hole and there's no components on the back, and there's a set of pins at the bottom. The interesting bit is there's no thin tracks, there's thin breaks between areas.