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0'"""c"y'·i- the relative values that have been input from the port.<br />
that there are limits on the dimensions of the screen area<br />
the HLIN command. These limits are 39 points in each direction.<br />
Note your display program steps in the following space:<br />
n,-,1,.,.., .... ,.<br />
used the following steps to generate a horizontal bar graph of<br />
information:<br />
GR: COLOR = 5<br />
FOR P = 1 TO 10<br />
D = A(P)/6.5<br />
HLIN O,D AT P<br />
NEXT P<br />
END<br />
steps were added to the program that we developed in Step 2.<br />
your program, or the one shown here.<br />
this set of program steps, the data value has been divided by<br />
so that instead of having a range between 0 and 255, the range<br />
"condensed" to be 0 to 39. The subscript for the array has also<br />
used to increase the starting position of each horizontal line.<br />
data starts at the top of the screen for A ( l), and proceeds down<br />
screen for the later data values. You could also use the value<br />
P to change the color for each of the horizontal lines.<br />
Additional changes can be made to the program so that a timeroutine<br />
is used in place of the INPUT A$ command. This<br />
mean that data values would be obtained at definite intervals,<br />
programmed in the delay routine. You would no longer need to<br />
the RETURN key to have a new data value acquired.<br />
Change your program so that a time delay routine is used in place<br />
the INPUT A$ command at line 40. Make the delay fairly long,<br />
2 or 3 seconds. Here is an example of a useful routine:<br />
FOR T =<br />
0 to 2000: NEXT T<br />
Connect the logic probe to the "A" output, pin 1, on the SN7402<br />
gate. The acquisition of a data value from the three-state in-
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