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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,
x, ranges from:
1 to 255
256 to 511
Then nl is:
and n2 is:
X
0
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.