I was trying to parse that too. “Computers” were themselves not commonplace, and even within that rarefied subcommunity, “screens” were CRTs, not LEDs. LEDs wer

I was trying to parse that too. “Computers” were themselves not commonplace, and even within that rarefied subcommunity, “screens” were CRTs, not LEDs. LEDs were limited to seven-segment digits and individual dots. I think “LED” is in small-caps, which is correct for typographical purposes, but requires the underlying text to be lowercase.