Each
computer in the IBM system/360 family is a sorted program computer or “Von
Neumann Machine”. The top-level logical architecture is as follow:
 |
| Top-Level Structure of a Computer |
Recall
that the actual architecture of a real machine will be somewhat different due
to the necessity of keeping performance at an acceptable level.
Here,
are more characteristics for the IBM system/360 architecture.
(i)
Since computers develop into families any proposed design would have to lend
itself to growth and to successor machines.
(ii)
Storage capacities of more than the commonly available 32,000 words would be
required.
(iii)
Certain types of problems require floating point word length of more than 36
bits.
(iv)
Since the largest servicing problem is diagnosis of malfunction, built in
hardware fault-locating aids are essential to reduce down-times.
(v)
The general addressing system would have to be able to refer to small units of
bits preferably the unit used for characters.
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