such as emphasized and double-width, one code turns the mode on and another turns it off. For graphics, the commands are more complicated because a code that turns on a graphics mode also specifies how many columns it will use. After the LQ-2500 receives this code, it interprets the next numbers as pin patterns and prints them on the paper.

The LQ has one command that allows you to use any of the 11 graphics options. The format of the command is:

ESCape =*” m nl n2 data

In this command, m selects the graphics option and nl and n2 specify the number of columns to reserve for graphics. The available graphics options are listed in Table 6-1.

Table 61. Graphics Options

 

 

Pins

m

 

Ho&. density

 

Option

 

 

(dots/in.)

 

Single-dens&

8

0

 

60

 

Double-density

 

0

1

I

120

 

Hiah-meed double-density’

 

8

2

 

120

 

Quadruple-density’

 

8

3

 

240

 

CRT I

 

8

4

 

80

 

CRT II

 

8

6

 

90

 

Single-density

 

24

3 2

 

6 0

 

Double-density

 

2 4

33

 

1 2 0

 

CRT III

 

2 4

3 8

 

9 0

 

Triple-density

 

2 4

3 9

 

1 8 0

 

Hex-density*

 

2 4

4 0

 

3 6 0

 

‘Adjacent dots cannot be pinted

In this mode

 

 

 

 

Column reservation numbers

The graphics command requires more than one number to specify how many columns to reserve because one line can use thousands of columns, but the LQ does not use numbers larger than 255 (decimal).

Graphics and User-defined Characters

6 - 5