Chapter 11: IBM - Graphics
11-12
bit number of the graphic byte assigned printer pins
7 (MSB) 1 and 2
6 2 and 3
5 4 and 5
4 5 and 6
3 7 and 8
2 8 and 9
1 10 and 11
0 (LSB) 11 and 12
7 (MSB) 13 and 14
6 14 and 15
5 16 and 17
4 17 and 18
3 19 and 20
2 20 and 21
1 22 and 23
0 (LSB) 23 and 24
In order to guarantee the grouping of graphic lines described abo-
ve, the following conditions must be fulfilled:
• The line spacing must be 8/120 inch.
• The command sequences with ESC L or ESC Y commands must
be separated in each case by a carriage return (CR) and a line
feed (LF).
• The length of the graphic lines may not go beyond the right mar-
gin of the page.
• The time pause between the two commands may be no longer
than one second.
Graphics of quadruple density at a aspect ratio of 1:1 have a quasi
resolution of 240 x 60 dots per inch. At this resolution, only 6 of the
24 pins of the print head are used per graphic byte. In order to
increase the throughput, the printer, under certain conditions,
prints four graphic lines in one pass if this is possible.
The following table shows the assignment of pins when printing
out a four-line graphic of quadruple density in one pass.
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