A system for determining whether a memory is connected to a controller in a
node of a data network. In order to utilize non-volatile memory elsewhere
in the system, it is possible to eliminate the EEPROM which is normally
connected to the controller. In order to indicate that the EEPROM is
deliberately missing, a pull-up resistor connected to a voltage source is
connected to the chip select signal line which normally runs between the
controller and the EEPROM. If a high signal is received, the controller
knows that the EEPROM is deliberately missing and that non-volatile memory
will be provided elsewhere in the system.
