Editing Resistor–transistor logic (section)

{{Short description|Class of digital circuits}}
'''Resistor–transistor logic''' ('''RTL'''), sometimes also known as '''transistor–resistor logic''' ('''TRL'''), is a class of [[digital circuit]]s built using [[resistor]]s as the input network and [[bipolar junction transistor]]s (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 component]]s, but in 1961 it became the first digital [[logic family]] to be produced as a [[monolithic integrated circuit]]. RTL integrated circuits were used in the [[Apollo Guidance Computer]], whose design began in 1961 and which first flew in 1966.<ref>{{cite book |chapter=2. Computers On Board The Apollo Spacecraft §2.5 The Apollo guidance computer: Hardware |chapter-url=https://history.nasa.gov/computers/Ch2-5.html |title=Computers in Spaceflight: The NASA Experience |publisher=NASA History Division |date=1987 |url=https://history.nasa.gov/computers/contents.html}}</ref>