IBM System/360 architecture: Difference between revisions

Revision as of 08:38, 14 December 2023

Revision as of 13:40, 1 January 2024

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{{main|Program Status Word}}

The '''Program Status Word''' ('''PSW''')<ref name=A22-6821-7/>{{rp|pages=71–72}} contains a variety of controls for the currently operating program. The 64-bit PSW describes (among other things) the address of the current instruction being executed, condition code and interrupt masks.

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==Interruption system==

The architecture<ref name=A22-6821-7/>{{rp|pages=77–83}} defines 5 classes of [[interrupt]]ion. An interruption is a mechanism for automatically changing the program state; it is used for both synchronous<ref group=NB>The S/360 literature does not use the terms fault or [[Trap (computing)|trap]]</ref> and [[asynchrony (computing)|asynchronous]] events.

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===Byte-aligned operands===

On some models, e,.g., the [[IBM System/360 Model 85|S/360-85]],<ref name=A22-6916/> the alignment requirements for some problem-state instructions were relaxed. There is no mechanism to turn off this feature, and programs depending on receiving a program check type 6 (alignment) on those instructions must be modified.

===Decimal arithmetic===

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==References==

;'''S360'''

:{{cite manualbook

| title = IBM System/360 Principles of Operation

| id = A22-6821-7

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<!-- See http://en.wikipedia.org/wiki/Wikipedia:Footnotes on how to create references using <ref></ref> tags which will then appear here automatically -->

{{Reflist| refs=

<ref name=A22-6821>{{cite manualbook

| author = IBM

| title = IBM System/360 Principles of Operation

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| mode = cs2

}}</ref>

<ref name=A22-6821-7>{{cite manualbook

| author = IBM

| title = IBM System/360 Principles of Operation

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| url = http://bitsavers.org/pdf/ibm/360/princOps/A22-6821-7_360PrincOpsDec67.pdf

| mode = cs2

}} Revised by {{cite manualbook

| author = IBM

| title = ibid.

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| date = May 12, 1970

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}} and {{cite manualbook

| author = IBM

| title = ibid.

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}}</ref>

<ref name=A22-6843>{{cite manualbook

| author = IBM

| title = IBM System/360 I/O Interface Channel to Control Unit Original Equipment Manufacturers' Information

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}}</ref>

<ref name=A22-6845>{{cite manualbook

| author = IBM

| title = IBM System/360 Direct Control and External Interrupt Features Original Equipment Manufacturers' Information

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| mode = cs2

}}</ref>

<ref name=A22-6884>{{cite manualbook

| author = IBM

| title = IBM System/360 Model 65 Functional Characteristics

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| mode = cs2

}}</ref>

<ref name=A22-6907>{{cite manualbook

| author = IBM

| title = IBM System/360 Model 91 Functional Characteristics

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}}</ref>

<ref name=A22-6916>{{cite manualbook

| author = IBM

| title = IBM System/360 Model 85 Functional Characteristics

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}}</ref>

<ref name=A22-6943>{{cite manualbook

| author = IBM

| title = IBM System/360 Model 195 Functional Characteristics

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}}</ref>

<ref name=GA27-2719>{{cite manualbook

| author = IBM

| title = IBM System/360 Model 67 Functional Characteristics

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| isbn = 0070506868

| url-access = registration

| url = https://archive.org/details/ibmmainframesarc00pras}} {{mdash}} Chapter 3 (pp. &nbsp;41{{ndash}}110) describes the System/360 architecture.

* {{cite conference

| conference = SHARE 117 in Orlando

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==External links==

* [http://bitsavers.org/pdf/ibm/360/GC20-1667-1_intro360arch.pdf Introduction to IBM System/360 Architecture] (Student Text)

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[[Category:Computing platforms]]

[[Category:IBM System/360 mainframe line|architecture]]