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Topic: Delay line memory

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  Delay line memory - Wikipedia, the free encyclopedia
Delay line memory was a form of computer memory used on some of the earliest digital computers, such as the EDSAC and UNIVAC I.
Thus the delay lines had to be timed such that the pulses would arrive at the receiver just as the computer was ready to read it.
Delay line memory was far less expensive and far more reliable per bit than flip-flops made from tubes, and yet far faster than a latching relay.
en.wikipedia.org /wiki/Delay_line_memory   (994 words)

 Delay line - Wikipedia, the free encyclopedia
In electronics and derivative fields such as telecommunications, a delay line is rigorously defined as a single-input-channel device, in which the output channel state at a given instant, t, is the same as the input channel state at the instant t−n, where n is a number of time units, i.e.
A transmission line or equivalent device (such as an analog delay line) used to delay a signal.
In digital logic and digital signal processing, a delay line refers to a sequential logic element in which the output state at a given time n (in samples) is the same as the input was at the time n−L.
en.wikipedia.org /wiki/Delay_line   (321 words)

 Delay line memory -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-06)
Data from the computer was sent to the piezo at one end of the tube, and the piezo would pulse and generate a small wave in the mercury.
To form a memory, additional circuity was added at the receiving end to send the signal back to the input.
Delay line memory was far less expensive and far more reliable per bit than (A backward somersault) flip-flops made from tubes, and yet far faster than a latching relay.
www.absoluteastronomy.com /encyclopedia/d/de/delay_line_memory.htm   (623 words)

 Calculator Memory Technologies
In a delay line memory the 1's and 0's of the binary data are converted to acoustic pulses at one end of a coil of wire.
The torsion pulse travels the length of the delay line where it is converted back to an electrical signal by a transducer with a similar arrangement to the sending end.
Delay line memory is a dynamic memory, that is the data being stored needs regular refreshing, and it is lost when the power is switched off.
www.vintagecalculators.com /html/calculator_memory_technologies.html   (866 words)

 UNIVAC I Mercury Delay Line Memory
In the amplifier (i-f) chassis the compensating delay is removed (from V7), and a dummy plug with dummy connections is substituted.
The line from pin 7 of the terminal board on the shell of the tank carries the memory output as far as a standoff post on the bay end of the tank.
The inner conductor of this line is the sheathed inner conductor from a standard coaxial cable.
ed-thelen.org /comp-hist/vs-univac-mercury-memory.html   (2505 words)

 Random Access Memory biography .ms   (Site not responding. Last check: 2007-11-06)
This is in contrast to sequential memory devices such as magnetic tapes, discs and drums, in which the mechanical movement of the storage medium forces the computer to access data in a fixed order.
Core memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “core” is still used by some programmers to describe the RAM at the heart of a computer).
Delay line memory used a sequence of sound wave pulses in mercury-filled tubes to hold a series of bits.
random-access-memory.biography.ms   (571 words)

 Delay-Line Memory   (Site not responding. Last check: 2007-11-06)
A delay-line memory resembles the human device of repeating a telephone number to one's self from the time it is found in the directory until it has been dialed.
The delay medium should slow the propagation rate of the information sufficiently so that the size of the storage equipment for a large number of pulses be within reason.
Other disadvantages of the delay-line memory systems are the access time (the maximum access time being the length of the delay) which is characteristic of a memory system with a cyclic access rather than random access, and the amount of terminal equipment required.
www.decodesystems.com /delay-line-memory.html   (571 words)

 The Old Computer Hut - Calculators (3)   (Site not responding. Last check: 2007-11-06)
The calculator with the case removed, the memory is inside the casing at the rear left hand side of the machine.
Originally, delay line memory used five foot long mercury-filled steel tubes and a store of any size might contain several hundred pounds weight of mercury.
The final refinement of the delay line was the nickel delay line, where the pulses of sound were recirculated within a coil of nickel wire.
www.arcula.demon.co.uk /calc3.htm   (312 words)

 Delay line memories   (Site not responding. Last check: 2007-11-06)
In an acoustic delay line memory, bits are inserted sequentially into one end of a long metal wire as acoustic pulses, by means of a transducer (see below).
The storage capacity of a delay line memory is determined by the pulse propagation speed, the physical length of the line, and the duration of a single pulse.
On both ends, the delay line is terminated with neoprene damping pads in order to prevent pulses from being reflected back into the line.
www.science.uva.nl /faculteit/museum/delayline.html   (457 words)

 The Programma 101 delay line memory   (Site not responding. Last check: 2007-11-06)
The memory of the Programma 101 is implemented as an acoustic delay line.
An important side-effect of this is that memory is only visible one bit at the time (i.e., the bit that is being amplified at the moment) and, even more important, to read a specific bit you have to wait for it to pass by.
The round-trip time of the P101 memory is 2.2 msec, and this means that to read a specific bit you have (on average) to wait 1.1 msec.
www.silab.it /frox/p101/delay.html   (401 words)

 Extensible delay-line memory
Several years ago, I posted some articles on the construction of a delay line memory that can be used as the infinite store of a universal computer embedded in Life.
In the Life implementation, the counter value is stored as the position of a block, and can (in principle) be incremented and decremented using a block pusher and a block puller, respectively.
In Life, a delay line stores a sequence of bits by endlessly recirculating a stream of gliders or spaceships.
www.radicaleye.com /lifepage/patterns/delay/dldesc.html   (1146 words)

A transmission_line or equivalent device (such as an analog_delay_line) used to delay a signal.
In digital_logic and digital_signal_processing, a ''delay line'' refers to a sequential_logic_element in which the output state at a given time ''n'' (in samples) is the same as the input was at the time ''n''−''L''.
In computing, ''delay line'' often refers to delay_line_memory.
www.witwib.com /delay_line   (221 words)

 Museum of Soviet Calculators - Iskra 111/M
As the delay increases, the frequency of signals diminishes, so that it is possible to store in one delay line no more than 5 thousand bits of data.
The basis of conversion of a delayed electrical signal to an sound (audio) signal is the phenomenon of magneto-restriction (MR).
In calculators, the lines on torsional oscillations are used, but at energization of these oscillations the method of conversion of longitudinal oscillations in torsional is used.
www.taswegian.com /MOSCOW/iskra111.html   (1996 words)

 Friden EC-132
The amount of memory available depended on the length of the wire and the filtering techniques used on the output side.
Acoustic delay lines were common in the early days of computing.
For example, having a delay line equal to the length of one video line allows a VCR to hide tape dropouts by replacing them with the signal from the line above.
www.hpmuseum.org /ec132.htm   (630 words)

 Circuit Cellar - Digital Library - EQ Answer
Delay-line memories in general are a way of storing information by converting an electrical signal into some other physical phenomenon, allowing it to propagate to another location where it’s converted back to an electrical signal.
Many early computers used acoustic delay lines of various types, where the electrical signal was converted into mechanical vibrations in, say, a column of liquid mercury or a steel wire.
This type of memory is slightly different in that the data gets regenerated at every step of the shift register, but clocking must be maintained continuously because the data is stored as charges on tiny capacitors.
www.circuitcellar.com /library/eq/175/1.htm   (327 words)

 The Computer Age
Plated wire memory, developed in 1957 at Bell Laboratories, uses the magnetic field produced by a flowing current in a wire to set or reset a magnetic field at the junction of intersecting wires.
Many different types of delay line have been built, ranging from tanks of mercury to radio waves, all working on the same principle of delay and recirculation.
This was considered a 'second generation' drum memory; first generation drums could be enormous and very heavy, yet their low cost made them a popular choice for mid-range computers in the mid to late 1950s.
www.moah.org /exhibits/archives/brains/computerage.html   (4346 words)

 The Music of CSIRAC
Because the memory was a recirculating delay line and the whole machine architecture was serial, it was required to wait until a particular memory location was available for reading.
Each memory tube was a delay line, so the data in each position in a memory tube required a different time to access.
Numbers were placed in specific memory locations in such a way that when they were read out and sent to the speaker, they were pulses with a pre-determined period.
www.cs.mu.oz.au /csirac/music   (667 words)

 Ellipsis - Wikipedia, the free encyclopedia
There are differences in typographical rules and conventions of using ellipses between languages.
The Chicago Manual of Style suggests the use of an ellipsis for any omitted word, phrase, line or paragraph from within a quoted passage.
There are two commonly used methods of using ellipses: one uses three dots for any omission, the second makes a distinction between omissions within a sentence (using three dots: …) and omissions between sentences (using a period and a space followed by three nonbreaking-spaced dots:.
northmiami.us /project/wikipedia/index.php/...   (1003 words)

 A Reentrant Delay-line Memory Using a YBa2Cu3O7-delta Coplanar Delay-line (ResearchIndex)   (Site not responding. Last check: 2007-11-06)
At present, the upper limit of the system clock rate is determined by the maximum clock rate of conventional semiconductor memory devices, such as the register files used in ATM cell buffer storage.
This is because the maximum clock rate of these register files is restricted by the propagation delay time between each register stage.
1 Fabrication of a 5-mm-wide YBCO coplanar delay line (context) - Hattori, Yoshitake et al.
citeseer.ist.psu.edu /515634.html   (345 words)

 Random_Access_Memory   (Site not responding. Last check: 2007-11-06)
As for carbon nanotube memory, a high-tech startup Nantero (http://www.nantero.com/) has built a functioning prototype 10 GiB array in 2004.
In today's computers memory access is becoming very slow when compared to CPU cycles since most computers use cheap, but comparatively slow, DRAM for the main memory.
Hence, the memory access, like hard disk access, might become the term that bounds computation speed.
www.apawn.com /search.php?title=Random_Access_Memory   (803 words)

 Unisys History Newsletter v5n1   (Site not responding. Last check: 2007-11-06)
A much-needed 600 line per minute printer (at 130 characters per line) was added in 1954.
The UNIVAC had the ability to store the control counter value in memory, making it possible for the flow of a program to go to a subprogram and then return to where it was in the main program.
Delays like this were usual, since the Philadelphia factory had limited capacity.
www.cc.gatech.edu /gvu/people/randy.carpenter/folklore/v5n1.html   (4401 words)

 Digital Delay line   (Site not responding. Last check: 2007-11-06)
At some point, the pulse delay circuit around IC 2b will be too slow for the incoming clock pulse but usually not to the point where it isn't still useful.
For example, If the pulse delay and other logic were to be replaced with true timing generation, this system would be able to clock at any speed.
Of course more RAM can be added for longer delays or less RAM clocked through in order to have very short delays for effects such as flanging and chorusing.
www.armory.com /~rstevew/Public/SoundSynth/Reverb/ddl.htm   (602 words)

 Articles - Random access memory   (Site not responding. Last check: 2007-11-06)
In computers, RAM can sometimes be allocated as a partition, allowing it to effectively act as a hard drive, only much faster.
Buffered RAM adds a buffer between the memory chips and the memory controller to reduce the load on their signal lines.
Registered RAM stores the states of the data and address lines before applying them to the memory array.
www.gaple.com /articles/Random_access_memory   (867 words)

 Early Devices display
These three were used to transmit a pulse down the line in a positive fashion, and these three are used to transmit a pulse down possibly another line, usually a different line, in a negative fashion.
SWAC was located at the National Bureau of Standards, in Los Angeles, 1951, and when the NBS office was closed (due to pressure from Senator McCarthy) moved to UCLA in 1953.
SWAC had 40 of these tubes, for a total memory capacity of 256 words of 40 bits each.
www-db.stanford.edu /pub/voy/museum/pictures/display/2-1.htm   (793 words)

 An Optical Delay Line Memory Model with Efficient Algorithms (ResearchIndex)   (Site not responding. Last check: 2007-11-06)
An optical fiber loop, used as a delay line, is the best candidate for primary, dynamic memory at this time.
However, they pose special problems in the design of algorithms due to synchronization requirements between the loop data and the processor.
We develop a theoretical model, which we call the loop memory model (LLM), to...
citeseer.ist.psu.edu /388784.html   (694 words)

 Delay line memory: Olivetti P203   (Site not responding. Last check: 2007-11-06)
These are pictures of a delay line memory unit from an Olivetti P-203 business machine, circa 1968.
Based on the information I found here, I'm guesstimating that the capacity of the unit is about 1000 bits.
He provided the following statistics for the delay line (and the rest of the machine it supported):
www.cs.rpi.edu /~collinsr/p203   (222 words)

 Random Access Memory - WebArticles.com
From top to bottom: DIP, SIPP, SIMM 30 pin, SIMM 72 pin, DIMM, DDR DIMMRandom access memory (sometimes random-access memory), commonly known by its acronym RAM, is a type of computer storage whose contents can be accessed in any (i.e., random) order.
RAM is typically used for primary storage (main memory) in computers to hold actively used and actively changing information, although some devices use certain types of RAM to provide long-term secondary storage.
In 2005, Compu-Technics Inc. presented a 256 GiB/4GHz non-volatile Magnetic RAM array, as well as a notebook using this chip, SG220.
www.webarticles.com /print.php?id=129   (807 words)

 Memory - Mounted Memory   (Site not responding. Last check: 2007-11-06)
Tony Stewart Pictures Sonoma Winner Mounted Memory: Mounted Memory has a picture of the winner with a piece of race used tire.
Top 10 directory results for "mounted memory" Are you finding out material.....offchance you were finding out text about Mounted Memory, our team has set up the.....from our...
Explore this exhibit, which is based on the Treasured Memories show mounted in 1997 to celebrate the Archives' 125th anniversary.
www.memorylive.com /memorysub/mounted-memory.html   (370 words)

 Biamp Systems DDL12 Digital Delay Line - AVsuperstore.com
The ADVANTAGE® DDL12 Digital Delay Line is a programmable DSP-based 1-input by 2-output digital delay.
Gain & delay settings are adjusted via Windows® 95 programming software, eliminating the need for front panel controls or security codes, and providing a completely tamper proof unit.
Up to 8 presets may be stored in non-volatile memory, and recalled via programmable logic inputs.
www.avsuperstore.com /moreinfo.cfm?id=2359   (215 words)

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