Headfixed Configurations Basic Configuration Main Control Unit (MCU) Environmental Control Unit (ECU) Headstage Combiner Unit (HCU) Stimulation Main Control Unit (MCU) Environmental Control Unit (ECU) 32-Channel Electrode Interface Board (EIB) 32 Channel Stimulation Headstage (UH32stim) Stim Capable Headstage Combiner Unit (SHCU) 2stim Adapter Share