This is a diagram with the following labels: Processor; Main memory; Internal secondary memory; Secondary memory subsystem; Removable memory subsystem; CMOS; CMOS input subsystem; Shutter button; Shutter input subsystem; Preview input button; Preview input subsystem; Flash input button; Flash input subsystem; Light meter; Light meter input subsystem; Screen; Screen output subsystem; Flash input button; Flash input subsystem; Zoom controller; Zoom output subsystem; Shutter controller; output subsystem.