DEFINING YOUR OWN CHARACTERS WITH IBM MODE
Downloading fonts in IBM mode requires downloading character Dot Pattern data and character Index Table data. Dot pattern data controls which pins fire when printing a character. Index Table data is placed in a “lookup table” that provides information on where Dot Pattern data is stored in memory and defines certain attributes of the character.
Assigning the download character set
You can define one or more download character sets for later use in IBM mode. Before you start to design your characters. you must define what character set(s) you want to download.
The character width on which you design the characters depends upon the character set as shown below:
Character set | Character width | Character ID |
Draft characters | 9 | 0 |
LQ pica characters | 35 | 1 |
LQ elite characters | 29 | ~ |
LQ proportional | 3 |
After you have decided your download character set, you must tell the printer where the download character data to be stored, and how many download character sets you will define.
The first download font area starts from <800F>h, and you must enter 0 for the Format byte. This Format byte indicates to the printer tha[ the RAM is stored the download character set.
Following the format byte. you must enter the Character ID data. If you want to define more character set, add 128 to the Character ID data.
The second area starts from <8911>h, the third area starts from <92 12>h,and the last area starts from <9B 13>h.But you need not enter the Format byte for these area.
