Radio Shack TRS-80 Model 100 Basic Manual page 108

You can print text in any order as well as any position using the PRINT@ statement,
as illustrated in the following example. Enter the commands:
CLS:FORX = 280T035STEP·35:PRINT@X,"·";:NEXTX
You should see the asterisks
(*)
spaced diagonally On the display as shown below:
Ok
•
*
*
*
*
-11:.
*
*
*
Notice that the printing started at the bottom and proceeded to the top.
You should experiment with printing text at various locations on the display until you
feel comfortable with the PRINT@ numbering scheme.
Experiment #3 Drawing Coordinate Axes
This experiment will show you how to draw standard X-Y type axes which will allow
sales data to be plotted in graph form. Enter the following program:
50 CLS
100 LINE(238t54)-(33t54)
150 LINE -(33t0)
Execute this program. You should see a pair of axes displayed:
Line 58 This statement clears the display.
Line
lee
The horizontal axis is drawn from right to left.
Line 158 The vertical axis is drawn from bottom to top. Note that the LINE statement
contains only one coordinate, - (33,0). This illustrates another form of the LINE
statement which assumes that the first coordinate is the same as the last cell referenced
in a LINE, PSET or PRESET statement. In this case, the last cell referenced was
(33,54) and is used as the beginning cell for the vertical line.
102