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Topic: Index registers

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In the News (Mon 18 Feb 19)

  Woodford County Almshouse Registers Index (1868-1957)
The Woodford County Almshouse Registers Index was compiled by Eric Groenke, intern for the Illinois Regional Archives Depository (IRAD) System at Illinois State University in Normal.
Each entry found in the index contains the following categories of information: the name, birthplace, age and occupation of the inmate; the date of admission to the almshouse; and the page and volume numbers.
Registers show the admission number; the name, birthplace, occupation, age and former residence of the inmate; the dates of admission and discharge; the date of death (when the inmate died while staying at the almshouse); and remarks.
www.cyberdriveillinois.com /departments/archives/wood.html   (631 words)

  Index register - Wikipedia, the free encyclopedia
An index register in a computer's CPU is a processor register used for modifying operand addresses during the run of a program, typically for doing vector/array operations.
Index registers were first used in the British Manchester Mark I computer, in 1949.
Before the invention of index registers, and without indirect addressing, array operations had to be performed either by linearly repeating program code for each array element (i.e.
en.wikipedia.org /wiki/Index_register   (212 words)

 Index Registers and Loops
Index registers on the 7090/94 were 15-bits in length (enough to span 32,768 words) and were used primarily for loop counters and to modify addresses.
Index registers had four specific associated instruction types: Load an index register; store the contents of an index register; increase or decrease the contents of an index register; and test the contents of an index register.
The contents of the index register could be added to the address field to form the final address by specifying the 2's-complement of the quantity in the source code which would also be subtracted to yield the same affect as adding (almost all of the remainder of the 7090/94 architecture was 1's-complement based).
www.frobenius.com /index-registers.htm   (795 words)

 Method and means to access and extended memory unit - Patent 3976976
When an instruction calls for indexing, the operand is modified by the specified index register as normal, the extended bits of that index register is appended to the resultant operand to form an extended effective address.
The output of the B register is fed to R' register (15 bits) which holds the quantity while it is added to the output of the lower-order 15 bits, UL, during address modification.
The output of the BX register (3 bits) is fed to holding register R'X, the output of which is fed to the SX portion (3 bits) of register 44.
www.freepatentsonline.com /3976976.html   (1832 words)

 Ibm 700 7000 Series   (Site not responding. Last check: 2007-10-19)
The three bits of the tag specified three (seven in the 7094) index registers, the contents of which were subtracted from the address to produce an effective address.
The Index registers operated using two's complement format and when used to modify an instruction address were subtracted from the address in the instruction.
The IBM 7094, with seven index registers had a "compatibility" mode to permit programs from earlier machines that used this trick to continue to be used.
www.wikiverse.org /ibm-700-7000-series   (274 words)

Registers are fast memory, almost always connected to circuitry that allows various arithmetic, logical, control, and other manipulations, as well as possibly setting internal flags.
In some RISC processors, constant registers are used to store commonly used values (such as zero, one, or negative one) — for example, a constant register containing zero can be used in register to register data moves, providing the equivalent of a clear instruction without adding one to the instruction set.
Index registers are used to provide more flexibility in addressing modes, allowing the programmer to create a memory address by combining the contents of an address register with the contents of an index register (with displacements, increments, decrements, and other options).
www.osdata.com /topic/language/asm/register.htm   (2271 words)

 Closed-loop reading of index registers using wide read and narrow write for multi-threaded system (US6188411)
When index registers are read in a multi-threaded system, programs in two different threads could access the same index register, each writing a different index into the index register.
The current thread detects that the index was overwritten by another thread by extracting the index from the 16-bit read and comparing it to the desired index.
whereby the stored index is read with the selected data from the selected data register that is selected by the stored index to determine when to re-execute reading the indexed registers.
www.delphion.com /details?pn=US06188411__   (618 words)

 Index Registers and Addressing
You put a pointer to it in the index register, and use an offset to the field you want in the offset field.
index register also gives us an opportunity to learn about a standard hack that manufacturers apply to their instruction sets to expand them beyond the limitations of their original design: a prefix byte.
When they wanted to add a second index register, they had a problem: their were too many instructions using indexed addressing to just add that many new op codes to the instruction set.
www.cs.nmsu.edu /~pfeiffer/classes/273/notes/index-addressing.html   (1087 words)

 Registers and Indexed Registers
A register is just a memory location, and can be accessed using the appropriate CPU instructions for the address space in which it lives.
For this reason, operations on index registers are often performed "atomically," or a lock is used to tell other threads or processes to keep their hands off the "index register" while you are using it.
In some, unfortunately not so rare, cases, the "index register" and "data register" are at the same location, and the location alternates between being the "index register" and being the "data register" with each access, often with a separate register to reset the first to index mode.
mojo.calyx.net /~bri/projects/GGI/GGPG/data-access-registers.html   (521 words)

 The Nonowt eZine X - First Steps in Machine Code - Part 6: Index Registers, In/Out, Interrupts
This extra facility offered by the index registers can be quite powerful, but is only likely to be used by the more experienced machine code programmer, so we'll deal with it in theory only.
Indexed addressing with the Z80 CPU is not as powerful as with other processors, such as the 6502, so if you don't want to use them, it is usually relatively easy to just use the other registers instead.
In this case it means that the register 'C' holds the identifying value of the port.
www.nonowt.com /magfold/mcodefol/mcode6.html   (2287 words)

 Commodore Hacking Issue 13: Exploiting the 65C816S CPU   (Site not responding. Last check: 2007-10-19)
After the D register is added to the 8-bit offset, the appropriate register is added, and the effective address is normalized to fall within bank 0.
When the index registers are changed from 16 bit to 8 bit, the high byte of each index register is lost and forced to zero.
However, unlike the index registers, MVN and MVP treats the Accumulator as 16 bits wide, regardless of the state of the M flag.
www.canberra.edu.au /~scott/C=Hacking/C-Hacking13/cpu.html   (4718 words)

 Brown County Almshouse Registers Index (1882-1963)
The Brown County Almshouse Registers Index was compiled by Tom Arbogast with the assistance of David Richards, interns for the Illinois Regional Archives Depository (IRAD) System at Western Illinois University in Macomb.
The 787 records in the database were extracted from the Brown County Almshouse Registers (IRAD Accession 2/0079/02).
Registers show the name, sex, color, birthplace, occupation before admission, age, marital status and former residence of the inmate; the nativity of the inmate's mother and father; health status; personal habits of the inmate (e.g.
www.cyberdriveillinois.com /departments/archives/brown.html   (639 words)

 [No title]
This leaves the index registers and accumulator/memory into 8 bit mode (which is the same as emulation mode).
While the status register is set for 16 bit memory/accumulator mode (m=0), data loaded is 16 bits wide with the load byte coming from the effective address and the high byte of the accumulator coming from the effective address plus one.
When the status register is set to 16 bit index register mode (x=0), the pull and push index registers will operate on 16 bits when the status register x is set to 0.
www.emulationzone.org /consoles/snes/files/65816a.txt   (13793 words)

 r_harvey - 8086 Processor Registers
One way to read the IP register is with a near call instruction, which places the value of the instruction pointer on the stack.
register within a procedure called from a high-level language unless you have allocated an internal stack for an exception handler or other task that requires extra stack space.
Copying between registers is straightforward; for semantic clarity (of which that phrase is not an example), we specify the source and destinations directly.
ourworld.compuserve.com /homepages/r_harvey/doc_cpu.htm   (3506 words)

 Great Microprocessors of the Past and Present   (Site not responding. Last check: 2007-10-19)
Spills and fills occur only at the ends of the cache, and registers are saved/loaded from the memory stack (normally implemented as a register cache separate from the execution stack, similar to the way FORTH uses stacks).
The 80C166 has sixteen 16 bit registers, with the lower eight usable as sixteen 8 bit registers, which are stored in overlapping windows (like in the SPARC) in the on-chip RAM (or register bank), pointed to by the Context Pointer (CP) (similar to the SP in the AMD 29K).
Unlike the SPARC, register windows can overlap by a variable amount (controlled by the CP), and the there are no spills or fills because the registers are considered part of the RAM address space (like in the TMS 9900), and could even extend to off chip RAM.
bwrc.eecs.berkeley.edu /CIC/archive/cpu_history.html   (15782 words)

 The Guide   (Site not responding. Last check: 2007-10-19)
Index Registers are register pairs and cannot be broken up to use as
Shadow Registers are a whole other set of all the registers.
This is useful and faster when you have a routine that destroys all the registers and you want to get them back later.
guide.ticalc.org /advanced/inde.htm   (359 words)

 JoDaviess County Almshouse Register Index (1846-1938)
The JoDaviess County Almshouse Registers Index was compiled by Jan Helge, member of the Illinois State Genealogical Society and South Suburban Genealogical and Historical Society, from records held by the Illinois Regional Archives Depository (IRAD) System.
The 345 records in the database were extracted from the JoDaviess County Almshouse Registers (IRAD Accession 1/0279/08).
Register shows the name, sex, color, birthplace, occupation before admission, age, marital status and former residence of the inmate; the nativity of the inmate's mother and father; health status; habits (e.g.
www.cyberdriveillinois.com /departments/archives/jodavalms.html   (619 words)

 Flash Economic Index registers highest monthly level in a year
The April reading of 103.2 -- up from 102.9 in March and 101.8 last October, its recent low point -- suggests that the state economy is on a steady course of moderate expansion, which places it somewhat at odds with the U.S. economy.
The Illinois economy had a higher growth rate than April a year ago (101.9) and was tied with the same (103.2) reading of May 1999.
The Flash Index is a weighted average of growth rates in consumer spending, personal income and corporate earnings.
www.news.uiuc.edu /news/00/0502flash.html   (310 words)

 Secretary of State Incorporation Index Registers, 1880-1919
They were created to help access other series of record books, incorporation case files, etc. The registers include building and loan associations, insurance firms, religious associations, and a wide range of other private businesses.
At times, a later index will repeat at least part of the information in earlier registers.
The last two volumes are the most comprehensive and should be consulted first when searching for information on a particular company; companies missed in those volumes might be mentioned in an earlier index.
historyresearch.utah.gov /inventories/378.html   (609 words)

 UKPG Database > Index of Registers   (Site not responding. Last check: 2007-10-19)
English Heritage Register of Parks and Gardens of Special Historic Interest in England
Register of Historic Parks and Gardens in Wales
Register of gardens in Northern Ireland, maintained by the Environment and Heritage Service.
www.gardenhistory.org.uk /ukpg/index_reg.htm   (95 words)

 Gareth's Help Page [2]   (Site not responding. Last check: 2007-10-19)
In 1979 all parish registers had to be deposited with the local Records Office unless it could be proved that the parish itself had adequate storage facilities in which the registers could be preserved.
In 1695 Church of England incumbents were ordered to register the births, not bapts, of dissenters in their parish, so the word "born" in a parish register may give a clue to dissenting parents.
Although no registers were kept, Catholics were baptised and even married by their missionary priests but usually went through a Church of England marriage too, to avoid a fine, to obtain legal registration and to avoid any doubt about the legitimacy of their children.
home.clara.net /tirbach/hicks3.html   (17124 words)

 Transportation Services Index registers third month-over-month rise in May
In May, the Transportation Services Index (TSI) of 112.6 rose 0.8 percent compared with April — the index’s third-straight month-over-month increase, according to the U.S. Department of Transportation’s Bureau of Transportation Statistics.
The May Passenger TSI of 111.2 registered a third-straight month-over-month increase, too, rising 1.8 percent compared with April.
The index also rose 8.2 percent compared with May 2004 and 20.0 percent compared with May 2003.
www.progressiverailroading.com /freightnews/article.asp?id=7322   (197 words)

 Transportation Services Index registers second-straight monthly gain in April
In April, the Transportation Services Index (TSI) of 111.7 rose 0.1 percent compared with March — the fourth month-over-month increase during past six months, according to the U.S. Department of Transportation’s Bureau of Transportation Statistics (BTS).
In addition, the index rose 1.6 percent compared with April 2004.
The TSI is a measure of month-to-month changes in the output of services provided by for-hire transportation industries, including rail, air, truck, inland waterways, pipelines and local transit.
www.progressiverailroading.com /freightnews/article.asp?id=7146   (202 words)

 Soviet Calculators History
It had a stack based on four registers, 98 steps of program memory, 14 registers of memory instead of the seven available on the B3-21, and most importantly - the capability to organize cycles and work with index registers.
D), the content of the X register, which is the display register, had to be moved to the Y register, causing Y to move to Z, and Z to T. Registers X and Y were used for most operations requiring operands.
Besides, the calculator had 26 memory registers, which could be increased at the expense of a reduction of the programs memory area.
www.xnumber.com /xnumber/russian_calcs.htm   (7136 words)

 Assisted British Immigration   (Site not responding. Last check: 2007-10-19)
Index to Registers of Assisted British Immigrants 1839-1871
The results screen displays some detail on each passenger and a reference to the book and page on which the information can be found in the registers on microfiche (the microfiche can be viewed at PROV reading rooms).
Click on 'Additional Help' at the bottom of the screen to see examples of these types of search.
proarchives.imagineering.com.au /index_search.asp?searchid=24   (124 words)

 History of computing hardware   (Site not responding. Last check: 2007-10-19)
By the 1900s earlier mechanical calculators, cash registers, accounting machines, and so on were redesigned to use electric motors, with gear position as the representation for the state of a variable.
All machines at that date still lacked what became known as the von Neumann architecture: their programs were not stored in the same memory 'space' as the data and hence programs could not be manipulated as data.
The first working von Neumann machine was the Manchester "Baby" or Small-Scale Experimental Machine, built at the University of Manchester in 1948; it was followed in 1949 by the Manchester Mark I computer which functioned as a complete system using the Williams tube for memory, and also introduced index registers.
www.sciencedaily.com /encyclopedia/history_of_computing_hardware   (4228 words)

 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
Examples are presented to show how ORed index registers can provide short, efficient, and, in some cases, more straightforward methods for doing certain jobs than more normal coding will allow.
Efficiency is gained not only because masking is nondestructive, but because masking and use of the extracted bits may be done in one instruction at no extra cost in time.
A simplified procedure for indexing arrays, masking, a fast method for using tabular values randomly, a simple symbol manipulation technique, decimal arithmetic in a binary machine, efficient program flow control, and an efficient method for counting ones are discussed.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=4069517   (157 words)

 Oregon Historical Records Index: Inmate Registers, Oregon State Penitentiary
The registers document information extracted from the” Great Registers,” which were created as inmates were received at the penitentiary.
Entries include: name of the inmate; conviction crime; length of sentence; and county in which they were tried and convicted.
A notation is made if there is a separate case file for the inmate, which may contain the commitment papers from the convicting county, correspondence about the inmate, and a photograph, if one exists.
www.sos.state.or.us /archives/banners/index/inmate.htm   (103 words)

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