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Description
This is how to draw in the Ti-81:

-Press "RANGE", set Xmin as 1 and Xmax as 96. Then Ymin as 1 and Ymax as 64. Finally set Xscl and Yscl as 100, all of these will make the display clean without axis and will tell you the coordinates of the pixel.

-Press "GRAPH"

-Press "2nd" > "PRGM" (DRAW)

-You will have the following options:
-ClrDraw: clears the entire drawing, once pressed, press "ENTER" to confirm.
-Line: Press "ENTER" to set the beginning point, move the cursor to the other point and press "ENTER" again to draw the line.
-PT-On: Press "ENTER" on the pixels you want to turn on.
-PT-Off: Press "ENTER" on the pixels you want to turn off.
-PT-Chg: Press "ENTER" on the pixels you want to change (if the pixel is ON, it will turn it OFF, if the pixel is OFF, it will turn it ON).
-DrawF: Write the number of the Y coordinate to draw a line across the screen in that height.
-Shade: Draws a line at the selected coordinates. For example: Shade(15,45) will fill all the pixels from 15 to 45. This is a very useful function to paint the entire screen, just enter the values (1,64).

Description
This is how to draw in the Ti-81:

-Press "RANGE", set Xmin as 1 and Xmax as 96. Then Ymin as 1 and Ymax as 64. Finally set Xscl and Yscl as 100, all of these will make the display clean without axis and will tell you the coordinates of the pixel.

-Press "GRAPH"

-Press "2nd" > "PRGM" (DRAW)

-You will have the following options:
-ClrDraw: clears the entire drawing, once pressed, press "ENTER" to confirm.
-Line: Press "ENTER" to set the beginning point, move the cursor to the other point and press "ENTER" again to draw the line.
-PT-On: Press "ENTER" on the pixels you want to turn on.
-PT-Off: Press "ENTER" on the pixels you want to turn off.
-PT-Chg: Press "ENTER" on the pixels you want to change (if the pixel is ON, it will turn it OFF, if the pixel is OFF, it will turn it ON).
-DrawF: Write the number of the Y coordinate to draw a line across the screen in that height.
-Shade: Draws a line at the selected coordinates. For example: Shade(15,45) will fill all the pixels from 15 to 45. This is a very useful function to paint the entire screen, just enter the values (1,64).