TI-99/4A sprite automotion speed measure

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United States Jason Doucette
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Published on ● Video Link: https://www.youtube.com/watch?v=C5pby9OI8PQ


Duration: 1:37
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Using Classic99 emulation of TI-99/4A to test sprite automation speeds. Resultant findings:

68 +/- 1 seconds to traverse width of screen at sprite automation speed of 1. That's 256 pixels. 68 seconds = 4080 frames, where each frame is 1/60th of a second. This means there are 15.9375 frames per pixel, according to the math with an inaccurate timing. Thus, the real value is 16 frames per pixel, at the slowest speed. This means each sprite coordinate on the GPU would require 8 bits for the 0..255 for X and Y, and another 4 bits for the precision of 16 sub-pixels per pixel.

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