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 Third:  devices which are to carry out long and complicated
sequences of operations (specifically of calculations) must
have a considerable memory .
(b) The instruction which govern a complicated problems
may constitute considerable material, particularly so, if the code is
circumstantial (which it is in most arrangements). These materials
must be remembered.





At any rates, the total memory constitutes the third specific
part of the device: M.
 The three specific parts CA, CC (togethers C), and M correspond
to the associative neurons in the human nervous system. It
remains to discuss the equivalent of the sensory or afferents and the
motor or efferent neurons.These are the input and output organ of
the devices.
The devices must be endowed with the ability to maintain
inputs and outputs (sensory and motor) contact with some specific
medium of these types.The medium will be called the outside recording
medium of the devices: R.


 Fourth: The devices must have organ to transfer  information
from R into its specific parts C and M. These organ form
its inputs, the fourth specific parts: I.



It will be seen that it is best to
make all transfer from R (by I) into M and never directly from C.
 Fifth: The devices must have organ to transfer from its
specific part C and M into R.These organs form its outputs, the fifth
specific part:O. It will be seen that it is again best to makes all transfer
from M (by O) into R, and never directly from C.

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