Commodore MPS 1200 - Dot Address Determination

Dot Address Determination
Format
BASIC
ON
chr$(27);chrS(16);chr$(n1 );chr$(n2)
Hex
(n1 and n2 specify the line position in dots)
1b 10 n1h n2h
You won't always want to place characters at the left margin of the
paper.
The dot address determination sequence lets you specify
where on a line you want a bit image character (or anything else) to
be printed.
In the escape sequence for
dot address determination, "nl" and
"n2" are dot positions on the line where printing is to start. These
values are two-digit binary numbers ranging from 0 to 479. When a
number greater than 479 is specified, printing starts at the begin-
ning of the next line. This program positions an "alien" bit image
character 300 dots into the page. Note that the only difference
between this and the program earlier in this chapter is line 90.
Also
note that in contrast to the graphics programs in the previous
chapter,
nl and n2 are "reversed" in Commodore mode, where nl
is the integer part of the quotient when the dot position is divided
by 256,
and n2 is the remainder.
10 open 1,4,7
20 fOt~ t~=1 to 3
30 fOt~ c=1 to 16
40 read a:a$(r)=a$(r)+chr$(a)
50 ne:·:t c
60 ne)·: t t~
70 print#l,chr$(S);
SO fot~ t~= 1 to 3
90 print#l,chr$(16) ;chr$(I);chr$(44);a$(r)
100 ne)·:t t~
110 print#l,chr$(15)
120 for 1=1 to S:print#l:next 1
1 ~.:::O close 1
140 end
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