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A comment on 3M Glass Cloth Tape 361. Parent comment

Re:3M Glass Cloth Tape 361 by Animats on Monday October 24, 2022 @03:28AM (#33313862)
That's why IC layouts used to be called "floor plans". They were floor-sized drawings on which people laid out lines with tape. The floor plan was then photographed from above and color-separated into masks.

"Back into the 40s?" ICs aren't that old.

Printed circuit boards have long been laid out by hand, and sometimes still are, but they're not usually photo-reduced. They're laid out at full scale.

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Re:3M Glass Cloth Tape 361 by monocasa on Monday October 24, 2022 @12:54PM (#33319188)
> "Back into the 40s?" ICs aren't that old.

I think the parent is saying that the verb 'tapeout' goes back to litho processes before litho's use in IC production, not that IC production went back to the 40s.

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