Radio Shack TRS-80 Operation Manual page 51

Computer Graphics
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®
Operation Manual
OFF ON
OFF OFF
OFF ON
Using XOR, the pixel is set ON if either the bit in the PUT
array or the corresponding pixel in the destination area
(but not both) is ON. In all other cases, the pixel is
turned OFF (reset). In other words:
OFF ON
OFF ON
ON OFF
The following BASICG program will graphically illustrate the
differences between the various action options. Since the program
will give you a ,"hard-copy" printout of the action options, you'll
need to connect your TRS-S.0 to a graphic printer. See "Graphics
Utilities" later in this manual for more details on using the
Computer Graphics package with a printer.
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