Radio Shack TRS-80 Operation Manual page 30

Computer Graphics Operation Manual
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The allowable values for direction are:
~
- zero degree angle
I -
9~
degree angle
2 -
18~
degree angle
3 -
27~
degree angle
Examples
This program line will cause characters to be displayed
starting in the center of the screen in normal left-to-right
orientation.
This program line will cause characters to be displayed
starting in the center of the top portion of the screen in a
vertical orientation, going from the top of the screen to
the bottom of the screen.
This program line will cause characters to be displayed
upside down starting at the right of the screen and going
towards the left.
This program line will cause the characters to be displayed
vertically, starting at the center of the lower portion of
the screen going towards the top of the screen.
----------lIadl8l11ae1l-------~--
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