1-bit computing

In computer architecture, 1-bit integers or other data units are those that are 1 bit (1/8 octet) wide.

An example of a 1-bit architecture that was marketed as a CPU is the Motorola MC14500B Industrial Control Unit (ICU),[6][7] introduced in 1977 and manufactured at least up into the mid 1990s.

[7] Its manual states: […] Computers and microcomputers may also be used, but they tend to overcomplicate the task and often require highly trained personnel to develop and maintain the system.

A simpler device, designed to operate on inputs and outputs one-at-a-time and configured to resemble a relay system, was introduced.

The Motorola MC14500B Industrial Control Unit (ICU) is the monolithic embodiment of the PLC's central architecture […] There are functions for which one bit machines are poorly suited.

However, by wiring the most significant bit of the memory's address high or low, the system designer can select between two separate programs with only a jumper option.

Other examples of 1-bit architectures are programmable logic controllers (PLCs), programmed in instruction list (IL).