US3372378A - Input/output unit switch - Google Patents

Input/output unit switch Download PDF

Info

Publication number
US3372378A
US3372378A US36271064A US3372378A US 3372378 A US3372378 A US 3372378A US 36271064 A US36271064 A US 36271064A US 3372378 A US3372378 A US 3372378A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
tape
units
unit
control
read bus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Ernest W Devore
Roy J Smith
John M Tyrrell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/30094Condition code generation, e.g. Carry, Zero flag
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F3/0601Dedicated interfaces to storage systems
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/30003Arrangements for executing specific machine instructions
    • G06F9/3005Arrangements for executing specific machine instructions to perform operations for flow control
    • G06F9/30058Conditional branch instructions
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F2003/0698Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers digital I/O from or to serial access storage devices, e.g. magnetic tape

Description

A 22S A: A: 53:05 E; .82

19 Sheets-Sheet l A: E: as:

A: A Z :Z 2:: Z

A: 2:5 AZ:

A: m z

E. W. DEVORE ETAL INPUT/OUTPUT UNIT SWITCH A: 2:; AZ: :5

A: 2:3 mt; Em

A: of; :2;

AA: 35 AZ:

March 5, 1968 Filed April 27, 1964 2;: SEW

AA: Al 72 5w $1: o A: @323 A:

A: 5.552: SI 32 A Z to H A A z; AZCE A 5:2 ASA: Z

A: 215w AZ:

10:25 A: N -2; am E :32 ES 5 :5 025::

5 SEE; 5 E;

A: 2:; A2: Cw

A 2:5 :2; Em

M L SM H. m HY m w mm ATTORNEY Mar h 5, 1 8 E. w. DEVORE. ETAL 3,372,378

INPUT/OUTPUT UNIT SWITCH Filed April 27, 1964 19 Sheets-$heet P.

FIG. 2 f k FIG.2A

To -A M FIG. 2E

W- Tc A 4 TAPE UNITS TUS TUS Tc-c W W s TAPE 8 TAPE 2 B UNITS UNITS Tc-A TC-B FIG. 2F

8 TAPE UNITS TC-B Tc-c TUS FIG.2C To A 8 TAPE TC B TUS TUS UNITS 8 TAPE 8 TAPE UNITS UNITS FIG. 20

To -A TC-B Tc -c We 8 TAPE UNITS March 5, 1968 E W. DEVORE ETAL INPUT/OUTPUT UNIT SWITCH Filed April 27, 1964 B1 I 01 az pfl B3 l' Iixl 05 FIG 20B I O1 B2- RLY '83 04 19 Sheets-Sheet 5 FIG.21A

sw o1 F|G.21 B

March 5, 1968 E. w. DEVORE ETAL 3,372,373

INPUT/OUTPUT UNIT SWITCH 19Sheets-Sheet 6 Filed April 27, 1964 2 3 E 5 2 Ew+ a; 2: g l 25 m2: is; /lll.lu. 3:3 I /VA \I\I l I V E5 2 F535 @2533 18% at" a: g 1+ 2: m2: is; W I\UJ1 25% I A l I I I I 35% Z 5616 ozinz m mDOmo March 1968 E. w. DEVORE ETAL 3,372,378

INPUT/OUTPUT- UNIT SWITCH 19 Sheets-Sheet Filed April 27, 1964 52 28 3 g 0; 52 E V 525 I2: 5:? Z: 5 1 M5050 A E ag $5 wmhdd W504 DP an OJ l N 88mg $2: $2 2Z2 3 22:; m [Ire :2 $22 5 Q: 22:

m Cufimw 3P V AZEIUV E E w is; as;

March 5, 1968 19 Sheets-Sheet l 1 Filed April 27, '1964 FIG. 12

TU-7 STATUS FIG.22

TAPE UNIT GROUP COMBINATIONS w 73 4 40 4 62 O .11 O R H m H L G 511 t v. r 40 5 s 37 w J .3 m J 2 R R 1 6 9% G 5 com 04 3 w 2 62 2 M L G H G 1 4 0 Q00 w 3 w E u 1 26 u 1 mm T .T. 04 QOMM March 5, 1968 Filed April 27, 1964 19 Sheets-Sheet l9 +A0,L.0. i)

I R AR 1 READ BUS P TU-O READ BUS P TC-A Q READ BUS 0 TU 0 READ BUS 2 TC-A READ BUS 2 ru-o READ BUS 5 TU-O READ BUS 5 TC-A E READ BUS 4 TU-O v READ BUS 5 TU-O READ BUS 5 TH RLY READ BUS s TU-O READ BUS 0 TH WRITE ECHO Tu-D WRITE ECHO TC-A READ BUS 7 TU-O A 86 READ BUS P TU-T A L READ BUS D TU-7 READ BUS 1 TC-A RLY READ BUS 1 READ BUS 7 TC-A READ BUS 2 8 READ BUS 5 TU-Y READ BUS 4 TU-Y READ BUS 4 TH READ BUS 5 TU-7 READ BUS 6 TCA RLY WR'TE ECHO READ BUS 6 TU-Y READ BUS 7 TU-Y A7, LO. Q AR United States Patent ()fiice 3 ,372,378 Patented Mar. 5, 1968 3,372,378 INPUT/OUTPUT UNIT SWITCH Ernest W. Devore, Poughlreepsie, Roy J. Smith, Wappingers Falls, and John M. Tyrrell, Hyde Park, N.Y., assignors to International Business Machines Corporation, New York, N.Y., a corporation of New York Filed Apr. 27, 1964, Ser. No. 362,710 21 Claims. (Cl. 340-1725) ABSTRACT OF THE DISCLOSURE An input/output (I/O) unit switch operated by a plurality of control units, permitting them to independently select and use any available I/O unit from a plurality of I/O units. No additional computer instruction is needed to recognize the existence of the I/O unit switch, which is a passive device that responds to standard I/O select instructions needed without the I/O switch. Coordinating selection circuitry prevents improper selection of any I/O unit. A modular configuration with nodes having slow speed (relay) bus switching circuits and high speed (semiconductor) control circuits permits full performance in switching and controlling magnetic tape units. The control units may be connected to the same or dilferent computer systems.

This invention relates generally to a switching system for selectively connecting any input/output (I/O) unit of a plurality of I/O units to any control unit of a plurality of control units. All control units can simultaneously operate with different I/O units. Furthermore, any I/O unit can be permanently made not available to any control unit on a selective basis.

The commonest means of selecting an I/O unit from a group of units is via a direct connection between a control unit and each of a plurality of I/O units. In this sense, a control unit is designed to accommodate up toa specific maximum number of I/O units.

Tape units are a form of I/O unit and hereafter are used to represent I/O units generally. Frequently, it is desired to increase the capacity of a magnetic tape unit installation without the use of special apparatus through the use of additional tape controls. In this case, each tape control selects among only its own bank of tape units, and it cannot operate tape units connected to other tape controls.

For example, an overall computer installation may have two tape controls and 16 tape units, in which 8 of the tape units are connected to one control unit while the remaining 8 tape units are connected to the remaining control unit. One tape control can operate only with one of its 8 tape units and cannot operate with the 8 tape units connected to the other control. In this event, the addition of a tape control and its tape units does not increase the flexibility of either the tape controls or the individual tape units, although it increases the I/O capacity of the system due to the addition of more units. It is, therefore, desirable to be able to find a convenient means of increasing the flexibility of an installation so that any of several tape controls can operate with any tape unit among all tape units at an installation. A method of accomplishing this end is a tape unit switch (TUS). The tape unit switch connects between a plurality of the tape controls and a plurality of tape units so that any of the plurality of tape units is selectable by any of a plurality of tape controls.

Various tape unit switches have been suggested, some of which are directly address programmable and require special instructions by the computing system in order to connect a given tape unit to a given tape control. Other tape unit switches are manually controlled to connect a particular tape unit to a particular tape control. The manual switch offers the flexibility of changing a semipermanent tape unit connection, but it cannot provide tape switching between data block transfers by a computer system without first stopping the system, which is highly undesirable.

It is an object of the invention to provide switching means to allow any of a plurality of control units to be connected selectively to any of a plurality of I/O units. In some cases, the total number of available I/O units can exceed the maximum number that can normally be attached to :a control unit.

It is an other object of the invention to provide an I/O switch which can operate without the necessity of any special computer instruction or any other special program intervention by a computing system, and yet can operate under complete computer control.

It is a further object of this invention to provide an I/O unit switch having the general physical configuration of a two-dimensional matrix.

It is another object of this invention to provide a switch that can operate all input-output lines between a control and its selected I/O unit.

It is a further object of this invention to provide switching circuitry that allows an overlapped operation between a high speed tape control unit and a relatively slow I/O unit by overlapping data bus switching with read or write delays of an I/O unit.

It is still another object of this invention to provide means for locking out the availability of a particular I/O unit to any one or more control units.

It is another object of this invention to provide an I/O switch capable of modular expansion for future increase in the number of I/O units and/ or controls in a computer installation.

It is object of this invention to provide an I/O switch between plural I/O units and plural controls, where the controls can be connected to different channels of the same computer system, or to channels of dilferent computer systems, or to channels of a computer system and to oft-line devices.

It is another object of this invention to prevent another control from interfering with the operation of an I/O unit once the I/O unit has been selected by any control.

It is an object of this invention to permit any control to sample the status or type of any I/O unit connected to an I/O switch, even though the I/O unit is being operated by another control.

It is another object of this invention to permit an I/O select instruction from a computer to any of its tape controls to select among any available tape unit in the computer installation.

It is a further object of this invention to provide a plural control-plural tape unit switch capable of switching among its tape units between normal data block transfers to or from a computer with no loss of time in system operation due to switching, compared to the time required to switch between tape units on a single tape control not having a tape unit switch.

The foregoing and other objects, features and advantages of the invention will be apparent from the follow-

US3372378A 1964-04-27 1964-04-27 Input/output unit switch Expired - Lifetime US3372378A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3372378A US3372378A (en) 1964-04-27 1964-04-27 Input/output unit switch

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US3372378A US3372378A (en) 1964-04-27 1964-04-27 Input/output unit switch
FR13951A FR1440771A (en) 1964-04-27 1965-04-21 Switching network for tapes unwinders
GB1674365A GB1083171A (en) 1964-04-27 1965-04-21 Improvements in or relating to data processing apparatus
NL6505325A NL154342B (en) 1964-04-27 1965-04-26 Connection system for import and export agencies.
DE19651574590 DE1574590B2 (en) 1964-04-27 1965-04-27

Publications (1)

Publication Number Publication Date
US3372378A true US3372378A (en) 1968-03-05

Family

ID=23427215

Family Applications (1)

Application Number Title Priority Date Filing Date
US3372378A Expired - Lifetime US3372378A (en) 1964-04-27 1964-04-27 Input/output unit switch

Country Status (4)

Country Link
US (1) US3372378A (en)
DE (1) DE1574590B2 (en)
GB (1) GB1083171A (en)
NL (1) NL154342B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474416A (en) * 1965-10-01 1969-10-21 Creed & Co Ltd Data editing system
US3593302A (en) * 1967-03-31 1971-07-13 Nippon Electric Co Periphery-control-units switching device
US3668651A (en) * 1970-12-30 1972-06-06 Ibm Working device code method of i/o control
US3731217A (en) * 1970-04-03 1973-05-01 Research Corp Quasi-optical signal processing utilizing hybrid matrices
DE2202658A1 (en) * 1972-01-20 1973-07-26 North American Rockwell An electronic musical instrument
JPS5152746A (en) * 1974-09-07 1976-05-10 Philips Nv Keisanki
US4155117A (en) * 1977-07-28 1979-05-15 International Business Machines Corporation Synchronizing channel-to-channel adapter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200380A (en) * 1961-02-16 1965-08-10 Burroughs Corp Data processing system
US3226688A (en) * 1961-07-03 1965-12-28 Bunker Ramo Modular computer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200380A (en) * 1961-02-16 1965-08-10 Burroughs Corp Data processing system
US3226688A (en) * 1961-07-03 1965-12-28 Bunker Ramo Modular computer system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474416A (en) * 1965-10-01 1969-10-21 Creed & Co Ltd Data editing system
US3593302A (en) * 1967-03-31 1971-07-13 Nippon Electric Co Periphery-control-units switching device
US3731217A (en) * 1970-04-03 1973-05-01 Research Corp Quasi-optical signal processing utilizing hybrid matrices
US3668651A (en) * 1970-12-30 1972-06-06 Ibm Working device code method of i/o control
DE2202658A1 (en) * 1972-01-20 1973-07-26 North American Rockwell An electronic musical instrument
JPS5152746A (en) * 1974-09-07 1976-05-10 Philips Nv Keisanki
US4155117A (en) * 1977-07-28 1979-05-15 International Business Machines Corporation Synchronizing channel-to-channel adapter

Also Published As

Publication number Publication date Type
DE1574590B2 (en) 1974-01-10 application
DE1574590A1 (en) 1972-04-06 application
GB1083171A (en) 1967-09-13 application
NL6505325A (en) 1965-10-28 application
NL154342B (en) 1977-08-15 application

Similar Documents

Publication Publication Date Title
US3648252A (en) Multiprogrammable, multiprocessor computer system
US3544973A (en) Variable structure computer
US3570006A (en) Multiple branch technique
US3398405A (en) Digital computer with memory lock operation
US3391394A (en) Microprogram control for a data processing system
US3581286A (en) Module switching apparatus with status sensing and dynamic sharing of modules
US3432813A (en) Apparatus for control of a plurality of peripheral devices
US3566363A (en) Processor to processor communication in a multiprocessor computer system
US3599176A (en) Microprogrammed data processing system utilizing improved storage addressing means
US3585605A (en) Associative memory data processor
US3500466A (en) Communication multiplexing apparatus
US3421150A (en) Multiprocessor interrupt directory
US3582902A (en) Data processing system having auxiliary register storage
US3389380A (en) Signal responsive apparatus
US4366535A (en) Modular signal-processing system
US4539637A (en) Method and apparatus for handling interprocessor calls in a multiprocessor system
US3668644A (en) Failsafe memory system
US5721870A (en) Lock control for a shared main storage data processing system
US4500958A (en) Memory controller with data rotation arrangement
US4253144A (en) Multi-processor communication network
US4281381A (en) Distributed first-come first-served bus allocation apparatus
US5291605A (en) Arrangement and a method for handling interrupt requests in a data processing system in a virtual machine mode
US3510844A (en) Interprocessing multicomputer systems
US4420806A (en) Interrupt coupling and monitoring system
US4443846A (en) Dual port exchange memory between multiple microprocessors