Star Micronics NX-2415II user manual Assigning the Index Table data

After you have written the compression mask bit data, line up all the character data for the compression mask bit that requires “O”.The telephone symbol looks like Figure 9-5.

F 9 Cc p t symbol.

Now we calculate the vertical numerical values of the columns of dots, and enter them underneath the grid. Each vertical column is first divided into three groups of eight dots. Each group of eight dots is represented by one byte, which consists of eight bits.

That’s where the numbers down the left side of the grid come in. Notice that there is a number for each row of dots and that each number is twice the number below it. By making these nu’rnberspowers of two we can take any combination of dots in a vertical column and assign them a unique value.

Assigning the Index Table data

Unlike defining in the Standard mode, you must assign the Index Table in the IBM mode.

This Index Table is prepared for the attribute data of each character, such as character type (Normal 24-dot high, or 30-dot high block graphics), the dot pattern data in the memory, and the compression mask bit data.

Each character requires 9 index table data.

The first and the second bytes (ml and rn2) indicate the position of the first

dot pattern in the memory. the high order byte, and m2 is the low order byte.