GB1228688A - - Google Patents

Info

Publication number
GB1228688A
GB1228688A GB1228688DA GB1228688A GB 1228688 A GB1228688 A GB 1228688A GB 1228688D A GB1228688D A GB 1228688DA GB 1228688 A GB1228688 A GB 1228688A
Authority
GB
United Kingdom
Prior art keywords
data
channel
register
signal
source
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
Application number
Inventor
G C Hiatt
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
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1228688A publication Critical patent/GB1228688A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/48—Program initiating; Program switching, e.g. by interrupt
    • G06F9/4806—Task transfer initiation or dispatching
    • G06F9/4812—Task transfer initiation or dispatching by interrupt, e.g. masked
    • G06F9/4831—Task transfer initiation or dispatching by interrupt, e.g. masked with variable priority
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/16—Handling requests for interconnection or transfer for access to memory bus
    • G06F13/18—Handling requests for interconnection or transfer for access to memory bus based on priority control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/22—Arrangements affording multiple use of the transmission path using time-division multiplexing
    • H04L5/24—Arrangements affording multiple use of the transmission path using time-division multiplexing with start-stop synchronous converters
    • H04L5/245—Arrangements affording multiple use of the transmission path using time-division multiplexing with start-stop synchronous converters with a number of discharge tubes or semiconductor elements which successively connect the different channels to the transmission channels

Abstract

1,228,688. Data storage. INTERNATIONAL BUSINESS MACHINES CORP. 27 Nov., 1969 [23 Dec., 1968], No. 57984/69. Heading G4C. A data processing system includes a plurality of data sources 10 each having addressable locations from which, when addressed, the data becomes available 12 periodically and its availability is signalled each time before it becomes available, a common channel 18 for transfer of data from the data sources capable of accommodating data from only one source at a time, priority selection means for determining which of the available sources shall have access to the channel and priority adjustment means for rendering more significant the priority of an available source each time it is not serviced. As disclosed, each data source 10 is a magnetic drum or disc store, a tape loop, a delay line store, a transistor bi-stable or magnetic core store, a shift register store or communication signal lines, but in each case providing the data cyclically and repetitively. The required record address for a given source 10 is inserted into registers 26, 28 after decrementing by 2 and 1 respectively at 22, 24. The address currently in reading position is specified by clock-driven (e.g. by pulses from a timing track) counter 16 and compared at 30, 32 with the register contents, equality from register 26 setting a flip-flop 34 and equality from register 28 resetting it. Flip-flop 34 supplies a "record ready" signal to channel 18, a scanner in which scans the "record ready" lines until it detects a "record ready" signal when it produces a corresponding "sample" signal ;36 to gate, at 38, the data to the channel 18 and reset the registers 26, 28. To prevent a given source required to present data to the channel from being passed over too many times, the contents of register 26 are decremented by 1 at 23 periodically, to start the "record ready" signal progressively earlier thereby effectively increasing its priority. As a modification, one decrementer can be dispensed with by providing an extra output from the counter 16.
GB1228688D 1968-12-23 1969-11-27 Expired GB1228688A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78613968A 1968-12-23 1968-12-23

Publications (1)

Publication Number Publication Date
GB1228688A true GB1228688A (en) 1971-04-15

Family

ID=25137698

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1228688D Expired GB1228688A (en) 1968-12-23 1969-11-27

Country Status (10)

Country Link
JP (1) JPS493213B1 (en)
AT (1) AT308429B (en)
BR (1) BR6915537D0 (en)
CH (1) CH495015A (en)
DE (1) DE1959480A1 (en)
FR (1) FR2026839B1 (en)
GB (1) GB1228688A (en)
NL (1) NL6918124A (en)
SE (1) SE377207B (en)
ZA (1) ZA698325B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5055018A (en) * 1973-09-21 1975-05-15
JPS51109521U (en) * 1975-03-01 1976-09-03
JPS5316215A (en) * 1976-07-30 1978-02-15 Jidosha Seiko Co Balancing mechanism
JPS57157581U (en) * 1981-03-31 1982-10-04

Also Published As

Publication number Publication date
FR2026839A1 (en) 1970-09-25
SE377207B (en) 1975-06-23
BR6915537D0 (en) 1973-01-04
FR2026839B1 (en) 1973-03-16
AT308429B (en) 1973-07-10
DE1959480A1 (en) 1970-07-09
JPS493213B1 (en) 1974-01-25
CH495015A (en) 1970-08-15
ZA698325B (en) 1971-07-28
NL6918124A (en) 1970-06-25

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee