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Probably the same thing as was used in second generation computers.
second generation
The first second generation computers came on the market in 1958.
the invention of transistor in 1947 provided a substitute for vacuum tubes in the second generation of computers. computers of this period all used magnetic-core storage systems for memory. -IBM 410 -Honeywell 800
The Second Generation Computer used transistors
Transistorized computers.
Second generation
yes
in second generation of computer transistor were used transistor are used instead of vaccum tube are used in first generation high level langauges such as gobsl, fortran are used
transistors
1956-1963
Second generation computers used electronic transistors. A small number used magnetic amplifiers.