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The information in the store is usually broken up into packets of moderately small size. In one machine, for instance, a packet might consist of ten decimal digits. Numbers are assigned to the parts of the store in which the various packets of information are stored, in some systematic manner. A typical instruction might say: «Add the number stored in position 6809 to that in 4302 and put the result back into the latter storage position». Needless to say it would not occur in the machine expressed in English. It would more likely be coded in a form such as 6809430217. Here 17 says which of various possible operations is to be performed on the two numbers. In this case the operation is that described above, viz., «Add the number…». It will be noticed that the instruction takes up 10 digits and so forms one packet of information, very conveniently. The control will normally take the instructions to be obeyed in the order of the positions in which they are stored, but occasionally an instruction such as: «Now obey the instruction stored in position 5606, and continue from there» may be encountered, or again: «If position 4505 contains 0 obey next the instruction stored in 6707, otherwise continue straight on».

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