Chapter 11: IBM - Graphics
11-11
Aspect ratio 1:1
bit number of the graphic byte assigned printer pins
7 (MSB) 01 to 03
6 03 to 05
5 06 to 08
4 08 to 10
3 11 to 13
2 13 to 15
1 16 to 18
0 (LSB) 18 to 20
The initiating command sequence for printing the graphic determi-
nes one of the four resolutions.
When the aspect ratio 1:1 is chosen, the assignment of the bits of a
graphic byte to the pins of the print head depends on the resolution
selected.
Graphics of single density with a aspect ratio of 1:1 have a resoluti-
on of 60 x 60 dots per inch. The assignment of bits of a graphic byte
to the pins of the print head is shown in the following table.
bit number of the graphic byte assigned printer pins
7 (MSB) 01 to 03
6 04 to 06
5 09 to 09
4 10 to 12
3 13 to 15
2 16 to 18
1 19 to 21
0 (LSB) 22 to 24
Graphics of double density with normal or half speed at a aspect
ratio of 1:1 have a resolution of 120 x 60 dots per inch. At this resolu-
tion, only 12 of the 24 pins of the print head are used per graphic
byte.
In order to increase the throughput, the printer, under certain con-
ditions, prints two graphic lines in one pass if this is possible.
The following table shows the assignment of pins when printing
out a two-line graphic of double density in one pass.
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