IBM 3083 Processor Complex

IBM 3083 Processor Complex

IBM 3083 Processor Complex
Announced Mar 31, 1982 and
withdrawn Aug 4, 1987
The following is the text of an undated IBM product brochure probably published in early-1984.

The IBM 3083 Processor Complex is a cost-effective growth solution for users who require the power and performance of a medium to large data processing system. There are seven 3083 models: The base models with Model Group E, Model Group B, and Model Group J, and the improved models, Model C, Model EX, Model BX, and Model JX. Only the improved models ("X" models) are currently in new production.

The improved models provide instruction execution rate improvements of 5 to 8 percent over the base models. The Performance Improvement Feature (PIF) available on base models E, B and J provides an improved instruction execution rate of 6 percent over installed base models.

The 3083 is a system with excellent processing power and capacity, and attractive physical characteristics. For users of the IBM 3083, the introduction of the System/370 Extended Architecture mode of operation provides an option which adds functional enhancements while permitting continued execution of existing programs. With these enhancements, the 3083 Processor Complex offers the power and growth potential to meet today's data processing requirements, as well as those of the future.


The IBM 3083 Processor Complex extends the processing range of the 308X family. Through the use of innovative circuit packaging technology, the 308X family offers a new entry level of performance, along with significant savings in space, power and cooling. The packaging technology used is the result of several years of systematic research. Benefits of this technology include enhanced reliability, improved availability and serviceability.

The IBM 3083 is compatible with other 30XX processors to protect programming investments and to allow for orderly transition as you step in processing power.

IBM 3083 Processor Unit

The 3083 Model CX has an instruction execution rate of about 0.75 times that of a 3083 Model EX.

The 3083 Models E and EX have an instruction execution rate about 2.8 and 2.9 times that of a 4341 Model Group 2, respectively, in an MVS/SP 1.3 batch environment.

The 3083 Models B and BX have an instruction execution rate ranging from 1.4 to 1.5 times the 3083 Models E and EX, respectively.

The 3083 Models J and JX have an instruction execution rate ranging from 1.8 to 2.0 times the 3083 Models E and EX, respectively.

As throughput measurements are highly dependent on configuration, applications and operating characteristics, individual jobstreams should be carefully evaluated before any estimate of throughput rate can be made.

The IBM 3083 offers the option of operating with either System/370 architecture or the new System/370 Extended Architecture. The 3083 support of System/370 architecture incorporates the System/370 Universal Instruction Set, System/370 Extended Facility, 3033 Extension feature, Extended Addressing, Virtual Machine Assist, Preferred Machine Assist and Data Streaming as standard features.

These provide the hardware and microcode support for a number of important extensions introduced into the System/370 product line in the past few years:

The System/370 Extended Architecture provides further extensions designed to support the large application systems you'll be developing in the '80s. These include:

IBM 3083 features

The IBM 3082 Processor Controller is the interface for control and servicing of the entire 3083 Processor Complex. To supervise the 3083 operation, it performs unit initialization, and makes available the various elements for use by the 3083 Processor Unit. The 3082 distributes microcode loads, provides control unit function for the system console, and assists in hardware error recovery.

For system maintenance and diagnosis, it controls an integrated service support console, provides communication support to remote locations, monitors, logs and analyzes failures and identifies failing components to allow for rapid isolation and repair. Diagnostic programs and error data collected are stored on an integrated disk file. Where a teleprocessing link does not exist, error log information can be physically transferred for analysis via a system diskette. The service support console can also be used as backup to a malfunctioning system or operator console. As an option, an IBM printer can be attached to print hard copies of data displayed on the service support or system console.

The IBM 3089 Power Unit is an optional unit connected to your mainline supply. It is designed to provide a stable 415 Hertz AC power source to units of the 3083 Processor Complex. Its low noise level should allow it to be installed in your data processing center.

The IBM 3087 Coolant Distribution Unit incorporates heat exchangers, controls, and two water pumps to supply cooling water in a closed loop to the IBM 3083 Processor Unit.

The 3087 Model 1 may be used to remove heat directly to the building's chilled water supply. The 3087 Model 2 offers the option of dissipating heat from the coolant through an air-cooled heat exchanger directly into the air of the computer room.

The temperature and flow of the cooling water supplied to the 3083 is continuously monitored by the microcode-driven 3082 Processor Controller. Any deviation from acceptable limits is signaled to the system operator.

The 3082 also periodically switches between the two coolant water pumps to help ensure high system availability.

System and operator consoles

System console functions are provided by a tabletop IBM 3278 Display Console Model 2A, which connects directly to the 3082 Processor Controller.

Operator console facilities can be provided by normal end-user terminals, such as the IBM 3277 and 3278 Display Stations and the IBM 3279 Color Display Station. They connect to the 3083 Processor Unit via IBM 3274 Control Units.

The system operator consoles have a remote operation capability far in excess of previously available consoles, allowing a better opportunity to construct a master control center appropriate to your particular site layout. In addition, an optional accessory table with space for two displays is available. It is designed to provide out-of-sight cable routing for displays and phones, and incorporates a bulletin-board-like end partition for the posting of new procedures, messages, schedules and charts.

Programming support

The 3083 Processor Complex can be operated with either MVS/SP, MVS/XA, VM/SP High Performance Option, ACP/TPF, DOS/VSE under VM/SP High Performance Option, or VS1/BPE under VM/SP High Performance Option.

MVS/System Product (MVS/SP) supports all models of the 3083. Version 1 of MVS/SP incorporates the support for the processor as well as the architectural extensions for the System/370 mode of operation.

MVS/Extended Architecture (MVS/ XA), comprised of MVS/SP Version 2 and the Data Facility Product, provides the base support for the System/370 Extended Architecture. MVS/XA also provides external compatibility with existing MVS systems at different levels, i.e., MVS/370 catalogs, JCL and user data set formats, most existing problem-state programs at source and object code level, and most operator messages and commands.

VM/System Product (VM/SP) with the VM/SP High Performance Option beginning with Release 2 supports the 3083 models in System/370 mode. It offers enhancements to large-system VM users with the new VM/SP High Performance Option. These include:

VM/XA Migration Aid facilitates the testing of MVS/XA while still supporting System/370 mode production work.

Airline Control Program/Transaction Processing Facility supports all models of the 3083.