NORBIT
In electronics, the NORBIT family of modules is a very early form (since 1960) of digital logic developed by Philips (and also provided through Valvo and Mullard) that uses modules containing discrete components to build logic function blocks in resistor–transistor logic (RTL) or diode–transistor logic (DTL) technology. == Overview == The system was originally conceived as building blocks for solid-state hard-wired programmed logic controllers (the predecessors of programmable logic controllers (PLC)) to replace electro-mechanical relay logic in industrial control systems for process control and automation applications, similar to early Telefunken/AEG Logistat, Siemens Simatic, Brown, Boveri & Cie, ACEC Logacec or Akkord Estacord systems.