This manual describes the IBM 1130 Computing System. A brief summary of 1130 system facilities is presented first, with more detailed information in subsequent sections.


The IBM 1130 Computing System is designed for general-purpose computing, which encompasses engineering, commercial, and scientific data-processing applications. This system is especially suited to individual operation by the person who requires a solution to a data-processing problem

On the other hand, because of the availability both of a wide variety of input/output (I/O) devices and of extensive programming support, the 1130 system is capable of meet ing the processing requirements demanded by a broad range of applications that do not require such direct interaction between operator and computer.

IBM makes available control program and programming language facilities for the 1130 system. These facilities are basically the following:

IBM also makes available a variety of specific application programs. In the aerospace, construction, engineering, fabrication, and assembly industries, the 1130 system can be be applied to the solution of such data-processing applications as:

In processing industries, some of the applications suitable for the 1130 are:

The preceding applications lists are, of course, not exhaustive; they merely point to some areas in which the 1130 system can be used successfully. Many other data processing jobs in such business activities as transportation, marketing, finance, insurance, utility, and distribution are applicable to solution by the 1130 system.

For the availability, method of ordering, and cost information of IBM products, whatever the product -- machine, education course, or program -- consult with your IBM representative.

For more specific details concerning the disk-monitor or card/paper-tape programming systems, the FORTRAN, RPG, or assembler languages, or other program facilities that IBM makes available for use with the 1130 Computing System, refer to other System Reference library publica tions. These publications are listed and abstracted in the IBM 1130 Bibliography, Order No. GA26-5916.


The principal unit in the 1130 Computing System is the IBM 1131 Central Processing Unit (CPU). Very compact and desk-like in appearance, the CPU (Figures 1 and 2) houses the system console. The CPU contains core storage and electronic circuits -- circuits that implement such functions as machine-instruction execution and interruption actions, and circuits necessary for the attaching of input/output devices to the system. The console printer, which operates at printing speeds up to 15.5 characters per second, is also located on the CPU frame.

Core-storage capacities of the models of the 1131 CPU are shown in Figure 3. The capacities are in words; a word is made up of 16 binary-digit positions in the 1130 system. (Other characteristics of data lengths, formats, and so forth are in subsequent sections of this book.) Also, in Figure 3, are listed the core-storage cycle times for the various models. A core-storage cycle is the time required to read a word from or store a word into core storage.

In addition to the core-storage capacities listed in Figure 3, the 1131 Models 2, 3, and 4 (not Models 1A, 1B, 1C, 1D, 5B, 5C, and 5D) contain a disk-storage drive that uses an IBM 2315 Disk Cartridge. This disk arrangement provides on-line storage for up to 512,000 words (1,024,000 bytes) of in formation on a single 2315 cartridge. Cartridges, however, can be manually changed, thus allowing for unlimited off-line storage of data.

Figure 1. IBM 1131 Central Processing Unit (Model 1A, 1B, 2A,2B, 4A, or 4B)
Figure 1. IBM 1131 Central Processing Unit (Model 1A, 1B, 2A,2B, 4A, or 4B)

Figure 2. IBM 1131 Central Processing Unit (Model 1C, 1D, 2C, 2D, 3B, 3C, 3D, SB, SC, and SD)
Figure 2. IBM 1131 Central Processing Unit (Model 1C, 1D, 2C, 2D, 3B, 3C, 3D, SB, SC, and SD)

1131 CPU Model Core-Storage Capacity (in 16-bit words)* Core-Storage Cycle Time (in micro- seconds)** Disk Storage
1A 4,096 3.6 No
2A, 4A 4,096 3.6 Yes
1B 8,192 3.6 No
2B, 4B 8,192 3.6 Yes
3B 8,192 2.2 Yes
5B 8,192 2.2 No
1C 16,384 3.6 No
2C 16,384 3.6 Yes
3C 16,384 2.2 Yes
5C 16,384 2.2 No
1D 32,768 3.6 No
2D 32,768 3.6 Yes
3D 32,768 2.2 Yes
5D 32,768 2.2 No

* The 16-bit word increment of information is accessed during a read or write operation. This 16-bit word is equivalent to two 8-bit bytes, a term used to describe an increment of information in other systems. Consequently, in terms of bytes, the available storage sizes in the 1130 system are 8,192, 16,384, 32,768, and 65,536 bytes.

** For Models 1, 2, 3, and 5. machine cycle time is the same as storage cycle time. For Model 4, machine cycle time is 5.85 microseconds. Machine cycle time is the time required for the CPU to perform one step in the execution of an instruction.

Figure 3. Storage Capacities and Cycle Times


IBM input and output devices that can be used in the 1130 Computing System are listed in this section. Consult with your IBM representative for detailed information concerning the installing of any 1130 system configuration.

Except for the console printer that comes as a part of the CPU, an attachment feature or feature combination is required before any I/O device can be connected to and used with the system. (Refer to the IBM 1130 Configurator, Order No. GA26-5915.)

Card Readers and Punches

IBM 1442 Card Read Punch Model 6 or 7

IBM 1442 Card Punch Model 5

IBM 2501 Card Reader Model Al or A2

Synchronous Communications Adapter (SCA)

This adapter permits the 1130 system to function as a remote processor terminal communicating with the following terminals or systems:

Disk Storage

Single Disk Storage (in 1131 CPU, Models 2, 3, and 4 only)

IBM 2310 Disk Storage Model Bi or B2 (up to four drives on a system)

IBM 2311 Disk Storage Drive Models 11 and 12 (up to two drives on a system)

Graphic I/O

IBM 2250 Display Unit Model 4

IBM 2285 Display Copier (The 2285 does not require program control. It provides paper copy of images displayed on the 2250.)

Optical Mark Reader

IBM 1231 Optical Mark Page Reader Model 1

Paper Tape

IBM 1055 Paper Tape Punch

IBM 1134 Paper Tape Reader


IBM 1627 Plotter Model 1 or 2


Console Printer (comes as a part of the 1131 CPU)

IBM 1132 Printer Model 1 or 2

IBM 1403 Printer Model 6 or 7

Sensor Based Systems

IBM System/7 (5010 Processor Module Models B2 through B16)

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