Star Micronics ND-10/15 user manual 118

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118

number that can be sent in one byte (253, the formula to work out nl and n2 is:

if the number of columns is X,

then nl = X MOD 256, and n2 = TNT(X/256)

Table 7-l may make the calculation easier.

		Table	7-1
		Calculating	nl and n2
If the number of columns,			Then	nl is:	and n2 is:
x, ranges from:
1 to	255		X		0
256	to	511	x-256		1
512	to	767	x-512		2
768	to	1023	x-768		3
1024	to	1279	x-- 1024		4
1280	to	1535	x-1280		5
1536	to	1791	x-l	536	6
1792	to	2047	x-l	792	7
2048	to	2303	x-2048		8
2304	to	2559	x-2304		9
2560	to	2815	x-2560		10
2816	to	3071	x-2816		11
3072	to	3264	x-3072		12

ml, m2 and so on are specitied as before, that is, any desired combination of pins will be fired by just one number. Because the top eight pins are used in the dot graphics mode, numbers between 0 and 255 (in other words, one byte) will tire a unique combination of pins to produce any pattern of dots. Thus ml, m2 and so on are the data ,bytes of the command.

To plot large graphics, use graph paper and draw a line every eight rows. Draw your graphic shape, and then calculate the values of each vertical column of eight dots; each value becomes one data byte. When drawing large shapes, the data byte CHR$(255) (all pins tiring, or a solid block of dots) is common.

_ A line spacing of 8/72 inch (using the < ESC > “A”CHR$(n), where n = S), will ensure that successive rows of dots will join perfectly.