1130 Facts folder: components

1131 Central Processing Unit, Model 1

• Core storage capability of 4096, 8192, 16,384 or 32,768 addressable binary words of 16 bits, plus two parity bits.
• Storage access cycle time of 3.6 microseconds.
• Internal binary data representation using 16-bit words consisting of 15 data bits plus sign.
• Automatic sign control.
• Extensive instruction set of 35 discrete instructions including load and store, arithmetic, shift, branch, I/O commands, automatic multiply and divide, and communications control.
• Single- and double-precision arithmetic functions for powerful computing capability.
• Automatic interrupt system with six levels of priority, enabling simultaneous operation of serial I/O devices.
• Direct and indirect addressing method plus indexing capability through three standard index registers.
• Arithmetic operations plus control of internal logical functions accomplished through ten basic machine registers.
• Odd-bit parity check on internal data transmission plus overflow check on add, subtract, and divide arithmetic operations.
• Processor-mounted console with visual indicators and switches plus flexible keyboard for manual entry and operator control.
• Console output from modified SELECTRIC typewriter at 15.5 characters per second, 13-1/8" pin-feed platen assembly, and maximum printing line of 126 characters at 10 characters per inch. Selectable vertical spacing of 6 or 8 lines per inch. Also, special console printer with attached ledger card handling feature.
• Communications tie-in provides standalone capability for immediate service to remote terminals and to the IBM System/7. Capability for data communication between 1130 and members of IBM System/360 and IBM System/370 families.
• Direct attachment of card and paper tape I/O devices through card/paper tape adapter.
• Direct attachment of 2310 Disk Storage or 2311 Disk Storage Drives through the Storage Access Channel.

1131 Central Processing Unit, Model 2

• Core storage capability of 4096, 8192, 16,348 or 32,768 addressable binary words of 16 bits, plus two parity bits.
• Storage access cycle time of 3.6 microseconds.
• Direct attachment of 2310 Disk Storage or 2311 Disk Storage Drives through the Storage Access Channel.
• Contains all features of Model 1, plus processor-contained direct access disk storage for one disk. Each 2310B Disk Storage Drive accommodates either one or two disks, allowing for a maximum configuration of five disks per system. All disk storage drives use removable and interchangeable 2315 Disk Cartridges.
• Access to information stored on 2315 Disk Cartridge is via high-speed data channel having transfer rate of 35,000 words per second. Data transfer is independent of processor operation and on a cycle-stealing basis under control of four channel registers. Seek, read, write, and write-check operations can occur independently and concurrently for all five disks.
• Processor communication with direct access disk storage by means of the automatic interrupt system.
• Disk cartridges contain a single disk with two recording surfaces accessible by a single read/write mechanism. Each disk cartridge has storage capacity of 512,000 sixteen-bit words. Up to 2560 words are available at each cylinder (track) position without access motion.
• Access time for one or two tracks is 15 ms with average access time for an entire 2315 at 520 ms.
• Built-in and programmable checking features ensure accuracy of data read from or recorded on direct access disk storage.
• Controls up to 16 low speed terminals, either remote or local, via the Multiple Terminal Communications Adapter.

1131 Central Processing Unit, Model 3

• Core storage capability of 8192, 16,384 or 32,768 addressable binary words of 16 bits, plus two parity bits.
• Storage access cycle of 2.2 microseconds.
• Includes all features of Model 2 processor.

1131 Central Processing Unit, Model 4

• Core storage capability of 4096 or 8192 addressable binary words of 16 bits, plus two parity bits.
• Storage access cycle time of 3.6 microseconds. Internal performance speed is approximately 62% of the 1131 Model 2 processor speed, depending on job mix.
• Contains all features of Model 1 except communications features. Processor-contained direct access disk storage for one disk is included. The disk storage drive uses removable and interchangeable 2315 Disk Cartridges.
• Access to information stored on 2315 Disk Cartridge is via high-speed data channel having a transfer rate of 35,000 words per second. Data transfer is independent of processor operation and on a cycle-stealing basis under control of four channel registers. Seek, read, write, and write-check operations can occur independently and concurrently for all five disks.
• Processor communication with direct access disk storage by means of the automatic interrupt system.
• Disk cartridges contain a single disk with two recording surfaces accessible by a single read/write mechanism. Each disk cartridge has storage capacity of 512,000 sixteen-bit words. Up to 2560 words are available at each cylinder (track) position without access motion.
• Access time for one or two tracks is 15 ms with average access time for an entire 2315 at 520 ms.
• Built-in and programmable checking features ensure accuracy of data read from or recorded on direct access disk storage.
• Attachment of 1442 Card Reader, 1132 Printer (Model 2), and 1627 Plotter increases flexibility of this system. No other I/O units may be attached.

1131 Central Processing Unit, Model 5

• Core storage capability of 8192, 16,384 or 32,768 addressable binary words of 16 bits, plus two parity bits.
• Storage access cycle of 2.2 microseconds includes all features of Model 1 processor.

IBM 1130 Computing System — Models Available