The commonest form of input-output device is the direct neural link. The connections are made to the peripheral nervous system. This is because the direct correspondence between the data carried and the actual pattern of neural firing in the peripheral nerves makes both writing the interfacing software and the process of learning to use the link easy. In contrast, it has proven extremely difficult to interpret the abstract neural structures representing ideas in the brain. Although cerebral neural interfaces do exist, learning to make use of them is a slow and difficult task.
Neural interfaces are assembled non-invasively by nanomachines that build the neural links from proteins delivered in the bloodstream. The links are then connected to local processor clusters and then to an external interface. In most cases there are two separate input-output systems: a low bandwidth system using a subdermal induction loops (this is typically shared by other internal systems) and a very high bandwidth optical jack.
The future of Ad Astra