Programming IS possible on a TV скачать в хорошем качестве

Programming IS possible on a TV

A standard-definition TV is a pretty low-resolution device - nominally you can get 640x480 pixels (or so) on it, but you're likely to find it very blurry as well. This video demonstrates, using a thirty-year-old BBC Micro (with a slightly dodgy keyboard) and an even older TV studio monitor (explicitly designed to have "typical" TV characteristics), that this is no great barrier to getting things done. The TV monitor is very compact and only supports monochrome. I begin by demonstrating that white or black lines at 3-pixel intervals (on a 640-pixel row) are still clearly resolvable. Then I switch to alternate white and black lines, which produce an almost uniform grey - not resolvable. Yet the listing text, using 8-pixel-wide characters, is still clearly legible. Then, at 4-pixel intervals, we demonstrate that thin lines are still visible on their own. Now I change to a 320-pixel row, and by keeping the coordinates the same as for the previous run, revert to the alternating lines. Because each pixel is twice as big as before, these lines remain easily resolvable. I then demonstrate that alternating rows (256 in total) are also resolvable. Notice that while the full height of the screen is occupied by the patterns, a lot of space remains to either side. It is thus difficult to align the vertical position to properly fit without losing the first or last lines of text. This is why 320x240 or 640x480 are now preferred to 320x256 or 640x256. As a final demonstration, I switch to a colour mode and - here's a program I typed in off-camera. This is one of the examples from the computer's original manual, a short program that produces a surprisingly complex image using Moiré interference patterns. At 320x256 however, the individual pixels are clearly visible, leading to the classic blocky pixelated effect. At 640x480 this would not be such a problem, but such a resolution is beyond this computer's capabilities. No such limitation for the upcoming Raspberry Pi. For those wanting to use the Composite Video output of that tiny computer for programming, I suggest using an 8x12 (or size 12) font or as near as possible to that, and 640x480 resolution. This should give you a text workspace slightly taller than and the same width as you see here, without hitting the edges of the screen. That should be plenty for working on small programs like these, and as you gain enough experience to try larger programs, you will also learn how to effectively deal with the inability to see it all at once.