3031 Processor Complex

IBM 3031 Processor Complex

IBM 3031 Processor Complex
Announced October 6, 1977 and
withdrawn February 5, 1985.

The following is the edited text of an IBM Data Processing Division technical press release distributed on October 6, 1977.

The new 3031 Processor, announced today by International Business Machines Corporation, can extend improved levels of performance to users of intermediate and large computers.

The 3031 Processor is capable of an instruction execution rate generally in the range of 2 to 2.5 times that of a System/370 Model 148 with similar programs and configurations running under Disk Operating System/Virtual Storage Release 34 or Operating System/Virtual Storage 1 Release 6. The lower end of the performance range generally is representative of a commercial and interactive job mix, while the upper end of the range generally represents scientific applications.

The 3031 processor complex includes the 3031 Processor with six channels, the 3036 console and the 3017 power unit.

Processor highlights

A compatible member of the System/370 family, the new processor is designed for users who want to expand their data processing capability but don't require the capacity or performance of IBM's top-of-the-line 3033 Processor.

The basic machine cycle time is 115 nanoseconds for the 3031 Processor. The new machine features 32,768 bytes of high-speed buffer storage -- equal to that available on the 168-3 and double the capacity of the 158-3. Buffer storage makes data available more rapidly to the processor at any given time. With the 3031, several instructions can be pre-fetched while one is being executed.

System/370 Extended Facility is a standard feature of the 3031. When utilized by IBM's MVS/System Extensions program product, it offers increased performance through reduced supervisor path lengths, more effective resource control and reduced software contention. Additionally, IBM's VM/System Extensions program product may be used with the 3031 processor and can provide major improvements for users of the VM/370 system control program in a number of areas of resource management, resulting in improved throughput and better terminal response time.

Channel design, features

The 3031 is available with two to six million bytes of main storage, in one-million-byte increments. The processor storage on the machine is four-way interleaved, a main storage access technique that increases the amount of data available to the processor over a given period of time. This enables the processor to handle a significantly faster data rate than, for example, the non-interleaved processor storage on the Model 158-3 or the Model 148.

One group of six channels is standard on the 3031 Processor. Each group consists of one byte multiplexer channel and five block multiplexer channels. Channels are physically integrated within the processor and operate independently of other processor functions. The byte multiplexer channels operate in the range of 40-75 thousand bytes per second, and each block multiplexer is capable of a data transfer rate up to 1.5 million bytes per second.

Additionally, an optional channel-to-channel adapter is available on the 3031 to allow data communication between channels on different processors, establishing a loosely coupled multiprocessor system.

Dual-display console

The 3031 processor complex includes IBM's 3036 console, announced last March with the 3033 Processor. The 3036 contains two console processors, which make possible improved system availability and serviceability. Each console features a dedicated display, keyboard, diskette drive and input/output channel connection. Either display can be designated an operator console or service support console.

The 3031 Processors are supported by MVS, OS/VS 1, Single Virtual Storage (SVS), Virtual Machine Facility/370 (VM/370), and the Airline Control Program (ACP). The processors also can utilize IBM's Time Sharing System/370 (TSS/370) programming. In addition, the 3031 is supported by DOS/VS.

Prices and availability

First customer shipments of the new 3031 Processors are scheduled to begin in the first quarter of 1978.

Under a 48-month contract, the new 3031 processor complex with two million characters of main memory, can be leased for $25,000 monthly. Monthly lease prices for the 3031 with three, four, five and six million characters will be $28,460, $31,920, $35,850 and $39,310, respectively. Monthly rental prices for the two through six million character versions are $27,497, $31,297, $35,097, $39,407 and $43,207. Purchase prices are $1,000,000, $1,110,000, $1,220,000, $1,345,000 and $1,455,000.

MVS and VM/370 support for the 3031 and DOS/VS support for the 3031 will be available at the time of first customer shipment. SVS, OS/VS 1 and ACP will be available in the second quarter of 1978.

The 3031 was developed at the IBM System Products Division facility in Poughkeepsie, New York, and will be manufactured there.