IBM 1130 User Manual page 439

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1131 CENTRAL PROCESSING UNIT

The 1131 CPU is available with three options:

With or without disk storage

3.6- or 2. 2-microsecond core storage access

4096, 8192, 16,384, or 32,768 words (16 bits)

of core storage

Although this yields 16 possible combinations, only

9 are currently available, as shown in Figure 45.1.

All 1131 CPUs, regardless of model, have as

standard components:

A console printer

A console keyboard

16 data switches

Console display lamps

Processing functions (index registers, in-

direct addressing, multiply/divide, etc.)

With Disk Storage

Figure 45.1.

Available 1131 Processing Unit Configurations

The first four components are described below in

more detail, since they may be directly used by

the programmer.

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