Resistor–transistor logic
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Resistor–transistor logic, sometimes also known as transistor–resistor logic, is a class of digital circuits built using resistors as the input network and bipolar junction transistors as switching de
Photograph of the dual 3-input NOR gate chip used to build the Apollo Guidance Computer. Connections (clockwise from top center) ground, inputs (3), output, power (Vcc), output, inputs (3). The six transistors (two groups of three) are in the center. The thin wires from the terminals to the transistors are resistors.
Flatpack RTL NOR gate integrated circuits in the Apollo Guidance Computer
Transistor–transistor logic
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Transistor–transistor logic is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function and the amplifying function, as opposed to ea
Resistor–transistor logic
…BJTs) as switching devices. RTL is the earliest class of transistorized digital logic circuit; it was succeeded by diode–transistor logic (DTL) and transistor–transistor logic (TTL). RTL circuits were first constructed with discrete components, but in 1961 it became the first digital logic family to be produced as a monolithic…
A real-time clock built of TTL chips around 1979