Radio Shack TRS-80 Operation Manual page 71

Computer Graphics Operation Manual
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Errors
If you enter incorrect parameters for any of the Graphics
Subroutines, your screen will display:
GRAPHICS ERROR
and return program control to TRSDOS Ready. This is the
only error message you'll get when executing the
Subroutines.
Important Note: Free memory is utilized by the Graphic
Routine for temporary storage. Extreme care should be
exercised if your program accesses this memory.
Routines/Functions
Most of the FORTRAN Subroutines and functions described in
this section have a corresponding command in the Graphics
BASIC Language Reference section of this manual.
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