Английская Википедия:IBM System/370 Model 168
Шаблон:Short description Шаблон:Infobox information appliance 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The 158 and 168 were withdrawn on September 15, 1980.
Features
Main memory
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]Шаблон:Rp
Шаблон:AnchorSystem console
The newly introduced IBM 3066 Model 2 System console
- included a light pen[NB 1]Шаблон:Cn
- replaced "most switch, pushbutton, and indicator functions"[NB 2][5]Шаблон:Rp
- as with the 165's Model 1, had a microfiche document viewer,[NB 3] a feature introduced for the 360/85's console.[NB 4]
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.Шаблон:Cn
Disk storage
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]Шаблон:Rp
Multiprocessing
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.
Extended precision floating-point
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]Шаблон:Rp
Emulation
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]Шаблон:Rp[6]Шаблон:Rp
Other listed options are:
- 7080 Compatibility
- 709/7090/7094 II Compatibility
There is a limitation, however, described as:
"Note: Compatibility features are mutually exclusive."
System/370 Extended Facility
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]
Шаблон:Anchor168-1 & 168-3
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]Шаблон:Rp
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]Шаблон:Rp
See also
Notes
References
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