The first baby steps in the early 1960s was "discretionary wiring" on bipolar "master dice breadboards" using gold ball wire bonds. These were intended as prototype devices.Figure 1 shows a chip without the wire bond interconnect and Figure 2 shows the schematic of the "breadboard chip" components. Figure 3 shows a "breadboard chip" with a rat's nest of wire bonds. If breadboarding was successful, the chip would be metalized for production.
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