Re: Non-working Commodore PET 3016
I thought they might have used a fine-pitch ripple on the upper white part of these, as it can make it a bit tougher / scratch-resistant and less prone to showing finger prints than a smooth coating. Although the black base was the more common anodised / enamel?
The bit later BBC Computer (plastic) cases and matching metal disk-drive plinths used to use the rippled approach, that seemed to work quite well (although still went yellow, especially the earlier ones with coarser ripple finish)
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