Epson LQ-850X User Manual - Page 143

Following the specification of the range of characters to be defined in this command are three data bytes, d0, dl, and d2, that specify the width of the character and the space around it. The left space (in dot columns) is specified by d0, and the right space is specified by d2. The second byte, dl, specifies the number of columns of dots that are printed to make up the character. By varying the width of the character and the spaces around it, you can create proportionalwidth characters that print at draft speed. The table below shows the maximum values for these bytes. Mode Draft Letter Quality 10 cpi Letter Quality 12 cpi Proportional d1 d0+dl+d2 9 12 29 36 23 30 37 42 The last part of the command to define your characters is the actual data that defines the dot patterns for each character. Since it takes three bytes to specify all the dots in one vertical column, your printer expects dl x 3 bytes of data to follow d2. Software and Graphics 4-27