3 ms·

Rubylith

• peter_d_sherman 6y ago
  >"Rubylith was used in the early days of semiconductors and integrated circuits.[1] The physical layouts of the first generations of Intel microprocessors (the Intel 4004[2] and the Intel 8008 (née 1201)) were first hand drawn on graph paper. A technician would then use a coordinatograph to precisely cut the rubylith and a knife to peel the appropriate sections away. The finished Rubylith mechanical masters were then photo reduced up to 100 times and then step and repeated on to glass plates for production use. Shortly after the 8008, Intel started using Calma's computer-aided design system that ran on a Data General minicomputer; the output masters may have stayed rubylith for a time, but other output options became available. Bell Telephone Laboratories, for example, had a high-resolution photoplotter.[3] The integrated circuit industry left rubylith for better technologies."