Manufacturer | International Business Machines Corporation ( IBM) |
---|---|
Product family | System/370 |
Release date | August 2, 1972 |
Discontinued | September 15, 1980 |
Memory | up to eight megabytes of integrated monolithic processor storage |
Website | Official website IBM Archives |
The IBM System/370 Model 168 and Model 158 [1] were both announced on August 2, 1972. [2] Prior 370 systems had not "offered virtual storage capability, which was to be a hallmark of the 370 line," and some said that the 168 and 158 were the first "real 370" products. [3] By contrast, "in 1972, the System/370 Advanced Function was released and had new Address Relocation Hardware and now supported four new operating systems (VM/370, DOS/VS, OS/VS1, OS/VS2)." [4]
The 158 and 168 were withdrawn on September 15, 1980.
Main memory, which was four-way doubleword interleaved, could be 1 to 8 megabytes, with offerings selectable in increments of one megabyte. [5]
The Model 168 used semiconductor memory, rather than the magnetic-core memory used by the 370/165 [5] introduced 2 years prior, resulting in a system that was faster and physically smaller than a Model 165. [5]: pp.3–5
The newly introduced IBM 3066 Model 2 System console
A console printer (up to 85 characters per second) to provide hard copy was optional when the console was in display mode, and required when it was in printer-keyboard mode.[ citation needed]
The newly introduced Model 11 of IBM's 3330 family of disk drives, featuring removable disk packs, has double the capacity of the prior 100-megabyte offerings. [NB 5] [NB 6] It can't be attached to a 370/165. [5]: p.94
Both the 370/168 and the 370/158 had MP (multiprocessing) models that offered "tightly coupled multiprocessing. [1]
The 168 was described [2] as having "two types of multiprocessing support" since it also offered attaching a second processing unit, an IBM 3062 Attached Processing Unit, which lacked access to Input/Output channels.
This feature adds support for 128-bit "hexadecimal" floating-point operands. It is standard on all 165 and 168 models, and is an "Optional (no-charge)" feature on the 370/158. [5]: p.137
The optional IBM 7070/7074 Compatibility Feature allowed the 168 to "run 7070 and 7074 programs at speeds that, in general, equal or exceed those of the original systems" [6] and yet "not affect normal operation of System/370." [5]: p.139 [6]: p.5
Other listed options are:
There is a limitation, however, described as:
"Note: Compatibility features are mutually exclusive."
This optional facility of the 168-3 provides support for MVS/System Extensions (MVS/SE) and for the later MVS/System Product (MVS/SP). [7]
The Third (June 1975) edition of IBM's 168 Guide introduced the 168-3.
"There are two versions of the Model 168: the Model 1 and the Model 3."
[5]: preface
IBM referred to the System/370 Model 168-3 as "the company's ... flagship." [NB 7]
The 168-3 CPU's internal performance has been described as 5–13% faster than the 168-1. [5]: p.125
The IBM System/370 extended facility or feature is available on all processor complexes and some models of System/370. Developed to support the internal structure of the MVS control program, this facility enhances the capabilities and performance of the MVS system when it is used with the MVS/System Extensions program product (program No. S740-XE1).
Manufacturer | International Business Machines Corporation ( IBM) |
---|---|
Product family | System/370 |
Release date | August 2, 1972 |
Discontinued | September 15, 1980 |
Memory | up to eight megabytes of integrated monolithic processor storage |
Website | Official website IBM Archives |
The IBM System/370 Model 168 and Model 158 [1] were both announced on August 2, 1972. [2] Prior 370 systems had not "offered virtual storage capability, which was to be a hallmark of the 370 line," and some said that the 168 and 158 were the first "real 370" products. [3] By contrast, "in 1972, the System/370 Advanced Function was released and had new Address Relocation Hardware and now supported four new operating systems (VM/370, DOS/VS, OS/VS1, OS/VS2)." [4]
The 158 and 168 were withdrawn on September 15, 1980.
Main memory, which was four-way doubleword interleaved, could be 1 to 8 megabytes, with offerings selectable in increments of one megabyte. [5]
The Model 168 used semiconductor memory, rather than the magnetic-core memory used by the 370/165 [5] introduced 2 years prior, resulting in a system that was faster and physically smaller than a Model 165. [5]: pp.3–5
The newly introduced IBM 3066 Model 2 System console
A console printer (up to 85 characters per second) to provide hard copy was optional when the console was in display mode, and required when it was in printer-keyboard mode.[ citation needed]
The newly introduced Model 11 of IBM's 3330 family of disk drives, featuring removable disk packs, has double the capacity of the prior 100-megabyte offerings. [NB 5] [NB 6] It can't be attached to a 370/165. [5]: p.94
Both the 370/168 and the 370/158 had MP (multiprocessing) models that offered "tightly coupled multiprocessing. [1]
The 168 was described [2] as having "two types of multiprocessing support" since it also offered attaching a second processing unit, an IBM 3062 Attached Processing Unit, which lacked access to Input/Output channels.
This feature adds support for 128-bit "hexadecimal" floating-point operands. It is standard on all 165 and 168 models, and is an "Optional (no-charge)" feature on the 370/158. [5]: p.137
The optional IBM 7070/7074 Compatibility Feature allowed the 168 to "run 7070 and 7074 programs at speeds that, in general, equal or exceed those of the original systems" [6] and yet "not affect normal operation of System/370." [5]: p.139 [6]: p.5
Other listed options are:
There is a limitation, however, described as:
"Note: Compatibility features are mutually exclusive."
This optional facility of the 168-3 provides support for MVS/System Extensions (MVS/SE) and for the later MVS/System Product (MVS/SP). [7]
The Third (June 1975) edition of IBM's 168 Guide introduced the 168-3.
"There are two versions of the Model 168: the Model 1 and the Model 3."
[5]: preface
IBM referred to the System/370 Model 168-3 as "the company's ... flagship." [NB 7]
The 168-3 CPU's internal performance has been described as 5–13% faster than the 168-1. [5]: p.125
The IBM System/370 extended facility or feature is available on all processor complexes and some models of System/370. Developed to support the internal structure of the MVS control program, this facility enhances the capabilities and performance of the MVS system when it is used with the MVS/System Extensions program product (program No. S740-XE1).