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The WAIT instruction will wait until the next interrupt received by the processor, and the CHIP8 implementation that was shown is designed for use with a CDP1861 video timing control chip that generates an interrupt shortly before the beam reaches the area where the visible portion of the display should start. The interrupt handler needs to save some ...


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There were lots of long answers up above, but the short, one-word answer is "yes." There are always scanlines on an old-school CRT with PAL or NTSC timing, especially when the video they were displaying was the hybrid "progressive" non-interlaced signals typical of all early-80s computers that could connect to a TV.


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