You may feel these symptoms first in your feet and then possibly in your shins: 1  Numbness, tingling and pain. 2  Unsteady when standing, walking. 3  Muscle weakness (including weak ankles) or cramps.
720HD is 1280 x 720 pixels per frame. The highest resolution that the DVD format can support is 720 x 480 pixels per frame for NTSC (or 720 x 576 pixels per frame for PAL), which is at best only 37.5% of the resolution of 720HD.
It is, of course, a CRT, and it's a 15khz display, meaning the highest resolution signal it accepts is 576 interlaced lines, or 576i. That limitation, however, makes it absolutely perfect for everything from the Nintendo Entertainment System to the first PlayStation. In fact, it may be a little too perfect.