90.02.05

The text read off it

[90.02.05]

If, in the above example, the Data organization for DATANAME was:

and ARECORD is located in an input buffer, the relative word position of DATANAME would be 1 and the symbolic instruction

CAL    DATANAME,4

would generate the machine instruction:

CAL    1,4

The form of a Base Locator word is:

PZE    LOC,,BYTE

where LOC is the word address of the first word of the data organization, and BYTE is the position in that word (0-5) of the first data item. By definition, a 'simple' Base Locator is one with BYTE always 0. Input records are located by 'simple' Base Locators. A 'complex' Base Locator, by definition, is one that locates items after a variable length array. The BYTE of a 'complex' Base Locator may range from 0 through 5 depending on the byte length of the array.

IV. PI - Positional Indicator

Positional Indicator cells are a type of 'pointer word'. These pointer words locate items within an array. When a CT operation such as SET causes a subscript to change value, the corresponding positional indicator is modified. A modification of this type might appear in the listing as:

CLA    CP)+1
ADD    PI)6
STO    PI)6

Storage for Positional Indicators is reserved immediately following the Base Locators by the instruction:

PI)    BSS    N

N is the total number of Positional Indicators.