Circuit board status detection system

In an electronic system, such as a digital data processing system, comprising a number of circuit boards, each circuit board being of a particular functional type and also uniquely identifiable by a manufacturing revision number, there is provided a status detection circuit for polling various programmable status information from the board, including a unique board identity number and the manufacturing revision number. The status detection circuit includes a microcomputer (60, FIG. 2) on each board 50. The data inputs of the microcomputer are responsive to a unique combination of switches (e.g., 42) representative of the manufacturing revision number. Other microcomputer inputs are responsive to a unique combination of edge connectors (e.g., 47) for uniquely identifying the particular board in the system. Another microcomputer input is responsive to an on-board status indicator, such as an LED. The status detection circuit can sequentially address each of the circuit board microcomputers and input any of several commands to them. For example, each board identity number, manufacturing revision level, and LED status can be read. Each board microprocessor can also be commanded to output any of several types of control signals, such as power on reset, system reset, set LED, and reset LED.