Operation Manual

Pu lting it together
Now vve can work through a simple exam ph.:. ~1..1ppos~ ~ w ~ w,mt L:;
draw two diagonal lines.
Step 1. Begin w1th LPRINT and the start graphics code for single
clensity graphics this time:
10 LPRINT CHR$(27);CHl{Si(/~l;
Step 2. ( (1t111t thE' columns in the trn<~f.E' . ThPrE' are 11. so we
c alculate n1 and n2 :
n2 = int (11 / 256) = 0
n: = 11 (n 2 x 256) = 11; and add them to t he statement:
10 LPRINT CHI\.$(:"'~ 1 :CHR$(75) ;CHR$(11) ;CHR$(0);
Step 3. \dd the dot values for each column
1 2 3 4 5 6 7 8 9 10 11
POSITION
128
•
•
VALUE
64
•
•
32
•
•
16
8
•
•
-·- 1---
• •
4
• •
2
ti l
I
--~
+
j +- l
1
e l,
•
-;--,.
I
- ~ ~
i
l
and add them to the statement:
10 LPRINT CHR$(27); CHR$(75); CHR$(11 ); CHR$(0);
CHR$(1) ;CHR$(2) ;CHR$( 4) ;CHR$(9) ;CHR$(18);
CHR$(36);CHR$(72);CHR$(144);CHR$(32);CHR$(64);CHR$(128);
Step 4. Run the program. The result should look like this. If not,
check the maths and typing and lry agam.
#'
4- 14 IBM Modes Arlva11ced Features