Radio Shack TRS-80 - Chapter 2: Expanding Programs; And the Program Grows

Computer Graphics Operation Manual
----------TRS·BO ® ----------
Y (0, - 32768)
(-,-)
(+,-)
x(- 32768,0) -------- (0,0) ( +32767,0)
(-,+)
(0,32767)
(+,+)
Figure 3. Graphics "Imaginary· Cartesian System.
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