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Page "Data General Nova" ¶ 9
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index and offset
** Relative with 8-bit signed offset with index, e. g. 8 ( PC, D2 )
) and the actual operation ( such as add or compare ) and other fields that may give the type of the operand ( s ), the addressing mode ( s ), the addressing offset ( s ) or index, or the actual value itself ( such constant operands contained in an instruction are called immediates ).
* New IX and IY index registers with instructions for direct base + offset addressing
Instead, the 16-bit segment registers now contain an index into a table of segment descriptors containing 24-bit base addresses to which the offset is added.
The segment register acts as an index into a table, which provides an offset to be added to the virtual address.
However a reference may also be the offset ( difference ) between the datum's address and some fixed " base " address, or an index into an array.
Modern computer designs generally do not include dedicated index registers ; instead they allow any general purpose register to contain an address, and allow a constant value and, on some machines, the contents of another register to be added to it as an offset to form the effective address.
A one byte offset, such as the hexadecimal ASCII value of a character ( e. g. X ' 29 ') can be used to point to an alternative integer value ( or index ) in an array ( e. g. X ' 01 ').
** Some processors contain registers that may only be used to hold an address or only to hold numeric values ( in some cases used as an index register whose value is added as an offset from some address ); others allow registers to hold either kind of quantity.
A virtual address in this schema could be split into three parts: the index in the root page table, the index in the sub-page table, and the offset in that page.
It may also be a slightly sneaky way of doing more calculation than normal in one instruction ; for example, using such an instruction with the addressing mode " base + index + offset " ( detailed below ) allows one to add two registers and a constant together in one instruction.
The offset — which character of the string to use on this iteration of a loop — is stored in the index register.
The offset — which item from the array to use on this iteration of a loop — is stored in the index register.
| load | reg | base | index | offset |
( Effective address = offset + contents of specified base register + contents of specified index register )
The base register could contain the start address of an array or vector of records, the index could select the particular record required, and the offset could select a field within that record.
The remaining columns of are each cyclic permutations of the vector with offset equal to the column index.
Data written with these rare drives complicates conversions today for retrocomputing archivists due to the sector offset skewing: the sectors start earlier than they would using the standard index hole placement.
The next stage is to cut up the premium coupon into a floater and inverse coupon, where the floater is a linear function of the index, with unit slope and a given offset or spread.
The non-clustered index tree contains the index keys in sorted order, with the leaf level of the index containing the pointer to the record ( page and the row number in the data page in page-organized engines ; row offset in file-organized engines ).
Waveguide dispersion can be made more negative by changing the index profile and thus be used to offset the fixed material dispersion, shifting or flattening the overall intramodal dispersion.

index and base
* n ( n-based indexing ): The base index of an array can be freely chosen.
For a vector with linear addressing, the element with index i is located at the address B + c · i, where B is a fixed base address and c a fixed constant, sometimes called the address increment or stride.
However, one can choose the index of the first element by an appropriate choice of the base address B.
Inflected into the unrealized inceptive aspect (' to be just about to tell '), the sign begins with the hand moving from in front of the trunk in an arc to the initial posture of the base sign ( i. e. index finger touching the chin ) while inhaling through the mouth, dropping of the jaw, directing eye gaze toward the verb's object.
Calculations of the addresses ( such as base + index ) were less expensive because they were performed by a special unit in the 286.
Since 2001, trim levels are also indicated by including a number after the main index: '- 00 ' means base trim level, '- 01 ' means standard trim and '- 02 ' designates deluxe version ; for example, VAZ-21121-02 means Lada 112 hatchback with an 1. 6L SOHC engine and deluxe trim.
*: 16-bit index or base register for 8-bit immediate offsets
*: 16-bit index or base register for 8-bit immediate offsets
To this could be added an index byte ( specifying the index register and 5-bit base address ), and up to 2 variable-length displacements per operand.
The decrement registers were a kind of index register whose contents were subtracted from the base address instead of being added to it.
In general we must select, for each element of the index set, an element of the nonempty set of limits of the projected ultrafilter base, and of course this uses AC.
Exponentiation is a mathematical operation, written as b < sup > n </ sup >, involving two numbers, the base b and the exponent ( or index or power ) n. When n is a positive integer, exponentiation corresponds to repeated multiplication ; in other words, a product of n factors, each of which is equal to b ( the product itself can also be called power ):
Processor registers are typically divided into several groups: integer, floating-point, SIMD, control, and often special registers for address arithmetic which may have various uses and names such as address, index or base registers.
with t the day of calculation ; N the number of constituent shares in the index ( usually 40 ); Q < sub > i, t </ sub > the number of shares of company i on day t ; F < sub > i, t </ sub > the free float factor of share i ; f < sub > i, t </ sub > the capping factor of share i ( exactly 1 for all companies not subject to the 15 % cap ); C < sub > i, t </ sub > the price of share i on day t ; Q < sub > i, 0 </ sub > the number of shares of company i on the index base date ; C < sub > i, 0 </ sub > the price of equity i on the index base date ; and K < sub > t </ sub > the " adjustment coefficient for base capitalization " on day t ( reflecting the switch from the French franc to the Euro in 1999 ).

index and address
When such a reference is found, an actual address is assigned and the availability table is changed so that the assigned index word or switch is no longer available for later assignment.
If the one- or two-digit address of an index word or electronic switch is used or is included in the operand of an XRESERVE or SRESERVE statement ( see page 99 ), the corresponding index word or electronic switch is reserved.
If a statement has been assigned an address in the index word area
by means of an origin statement which refers to an actual address, the corresponding index word will be reserved.
Extreme caution should be used, however, to avoid the conflicting usage of an index word or electronic switch which may result from the assignment of more than one name or function to the same address.
If the symbolic name or actual address of an index word or electronic switch appears or is included in the operand of an XRELEASE or SRELEASE statement ( see page 101 ), the specified index word or electronic switch will again be made available, regardless of the method by which it was reserved.
The declarative statement EQU permits the programmer to equate symbolic names to actual index words, electronic switches, arm and file numbers, tape channel and unit numbers, alteration switches, etc., and to equate a symbol to another symbol or to an actual address.
This item may be a symbolic name or an actual one-digit or two-digit index word address in the range 3 - 94.
When an actual index word or a symbolic address is specified, Autocoder will equate the name IOCSIXF to it.
This item may be a symbolic name or an actual one-digit or two-digit index word address in the range 3 - 94.
When an actual index word or a symbolic address is specified, Autocoder will equate IOCSIXG to it.
For example, an array of 10 integer variables, with indices 0 through 9, may be stored as 10 words at memory addresses 2000, 2004, 2008, … 2036, so that the element with index i has the address 2000 + 4 × i.
In standard arrays, each index is restricted to a certain range of consecutive integers ( or consecutive values of some enumerated type ), and the address of an element is computed by a " linear " formula on the indices.
The coefficients c < sub > k </ sub > must be chosen so that every valid index tuple maps to the address of a distinct element.
If the minimum legal value for every index is 0, then B is the address of the element whose indices are all zero.
Some models have the ability to extend memory capacity to store more numbers ; the extended address is referred to as an array index.
Each color has its own address ( index )— consider it as a descriptive reference number that provides that specific color when the image needs it.
To illustrate, suppose a is the memory address of the first element of an array, and i is the index of the desired element.

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