31. Clever circuitry has improved the color in modern TVs, but there are still only 525 scan lines . 32. A hypothetical scan line , with B representing a black pixel and W representing white, might read as follows: 33. The cameras scanned at a rate of 5 vertical scan lines per second, each composed of 512 pixels. 34. Placement of the framing mask at the left or right side of the disk gives vertical scan lines . 35. In principle, all three color encoding systems can be combined with any scan line / frame rate combination. 36. Fast Pot scanning increments the counter on every cycle and returns a usable result within two scan lines . 37. In " progressive scan " systems, each refresh period updates all scan lines in each frame in sequence. 38. The 36 kHz carrier frequency was chosen to render the system immune to interference from TV scan lines . 39. Harman Kardon claims its progressive scan output provides exceptional detail and color and all but eliminates scan lines . 40. Vertical Scrolling would ordinarily not be considered useful for ANTIC Mode F which is one scan line tall.
