Star Micronics NB24-10/15 user manual Then nl is

I ‘.

121

Table 7-3

Calculating nl and n2.

If the number of col- umns, x, ranges from:

1 to 255

256 to 511

512 to 767

I 768 to 1023 1024 to 1279 1280 to 1535 1536 to 1791 1792 to 2047

3072 to 3264

Then nl is:			and n.2is:	I
X	9cc		0
y-			1
x-	iJl&	I	6	I
--x- 768.--			3	I
x_-1024--_		I	4
:--1280		I	i
x	----
x-	1536		6	1
x-	1792
_	----	1
:-2560		I	li
.	9OlC		11
x-3072			12	1

When you are using the 24-dot graphics modes you must send three bytes of data for each dot column, as you’ve done with the download characters. Therefore, you refer to dot columns in- stead of bytes of graphics data when calculating nl and ~2.

m Specifying the graphics data

Now that we’ve told the printer how much data to expect, we better figure out how to send that information! Just as you do with download characters, with dot graphics you have control over firing of every single pin of the print head. When this printer produces &dot graphics modes, it prints with every third pin with the Standard mode. It acts like a printer with nine wires that can only produce &dot graphics except the vertical length. If you want to align the vertical length, use the IBM modes. With this mode, we’ve designed to align fully compati- ble with the IBM Graphics printer or Proprinter. In Figure 7-6, you can see that we’ve labelled each pin on the print head with a number as we did with download characters. And specifying pins to fire is done in the same way: to fire the second pin from the top, for instance, send a CHR$(64). Firing several pins at once is done in a similar fashion. For example, to print the first,