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]
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
replaced "most switch, pushbutton, and indicator functions"[NB 2][5]: p.32
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.[citation needed]
Disk storageedit
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
Multiprocessingedit
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
Emulationedit
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:
7080 Compatibility
709/7090/7094 II Compatibility
There is a limitation, however, described as: "Note: Compatibility features are mutually exclusive."
System/370 Extended Facilityedit
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]
168-1 & 168-3edit
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
^ ab"System/370 Model 158". IBM Archives. IBM. 23 January 2003.
^ ab"System/370 Model 168". IBM Archives. IBM. 23 January 2003.
^"What Course for the 3081?". Computerworld. November 24, 1980. p. 34.
^Marshall, David; Reynolds, Wade A.; McCrory, Dave (17 May 2006). Advanced Server Virtualization. p. 8. ISBN1420013165.
^ abcdefghi"A Guide to the IBM System/370 Model 168" (PDF). IBM. June 1975.
^ ab"7070/7074 Compatibility Feature for IBM System/370 Models 165, 165 II, and 168" (PDF). IBM. June 1973. GA22-6958-1.
^"IBM System/370 Extended Facility" (PDF). IBM System/370 Extended FacilitY(PDF). IBM. January 1978. p. 4. GA22-7072-0. 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).
January 01, 1970
system, model, model, were, both, announced, august, 1972, prior, systems, offered, virtual, storage, capability, which, hallmark, line, some, said, that, were, first, real, products, contrast, 1972, system, advanced, function, released, address, relocation, h. 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 IBM System 370 Model 168ManufacturerInternational Business Machines Corporation IBM Product familySystem 370Release dateAugust 2 1972 1972 08 02 DiscontinuedSeptember 15 1980Memoryup to eight megabytes of integrated monolithic processor storageWebsiteOfficial website IBM Archives The 158 and 168 were withdrawn on September 15 1980 Contents 1 Features 1 1 Main memory 1 2 System console 1 3 Disk storage 1 4 Multiprocessing 1 5 Extended precision floating point 1 6 Emulation 1 7 System 370 Extended Facility 2 168 1 amp 168 3 3 See also 4 Notes 5 ReferencesFeatures editMain memory edit 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 System console edit The newly introduced IBM 3066 Model 2 System console included a light pen NB 1 citation needed replaced most switch pushbutton and indicator functions NB 2 5 p 32 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 citation needed Disk storage edit 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 Multiprocessing edit 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 edit 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 Emulation edit 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 7080 Compatibility 709 7090 7094 II Compatibility There is a limitation however described as Note Compatibility features are mutually exclusive System 370 Extended Facility edit This optional facility of the 168 3 provides support for MVS System Extensions MVS SE and for the later MVS System Product MVS SP 7 168 1 amp 168 3 editThe 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 See also editList of IBM products IBM System 360 IBM System 370Notes edit Although only the 158 announcement mentioned the light pen the 168 s manual says light pen is standard among the few retained system clear and cooling reset alarm the online manual has an extra dot d ocument the 360 85 article includes a photo of same It has the same number of platters but double the number of data cylinders Similar to the Massbus DEC RP05 RP06 100 MB 200 MB capacities and number of cylinders https www 03 ibm com ibm history exhibits 3033 3033 intro html when comparing it and the then new IBM 3033 References edit a b System 370 Model 158 IBM Archives IBM 23 January 2003 a b System 370 Model 168 IBM Archives IBM 23 January 2003 What Course for the 3081 Computerworld November 24 1980 p 34 Marshall David Reynolds Wade A McCrory Dave 17 May 2006 Advanced Server Virtualization p 8 ISBN 1420013165 a b c d e f g h i A Guide to the IBM System 370 Model 168 PDF IBM June 1975 a b 7070 7074 Compatibility Feature for IBM System 370 Models 165 165 II and 168 PDF IBM June 1973 GA22 6958 1 IBM System 370 Extended Facility PDF IBM System 370 Extended FacilitY PDF IBM January 1978 p 4 GA22 7072 0 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 Retrieved from https en wikipedia org w index php title IBM System 370 Model 168 amp oldid 1139935286, wikipedia, wiki, book, books, library,
