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Figure 1-2.
IBM 2030 Processing Unit
To fit the widely varied cost and volume
needs of all computer users, the IBM
System/360 is available in many differ-
ent models.
For instance, to fit the
needs of the user who needs a minimal
number of answers per month, a Model 30
is available at a minimal cost.
For the
user who needs a greater number of
answers per month, a Model 70 is availa-
ble that will give approximately 50
times as many answers per month as a
Model 30.
The answers will be the sallie;
only the number of answers in a given
period of time will be different.
There
are two basic differences between
models: core storage capacity and
inter~
nal processing speeds.
Figure 1-3 shows
the core storage capacities for the
different System/360 models.
Internal
processing speed is largely dependent on
the speed of the core storage unit and
the amount of data involved on each core
storage access.
Core storage speed in
the System/360 varies from 2 micro-
seconds per single byte access on the
Model 30's to 1 microsecond per eight-
byte access on tpe Model 70's (Figure
1-4) •
1-3
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