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2 These boxes would cause an <== Invalid message when Enter was pressed. 3 I noticed that when the boxes were displayed, I tended to be pressing down on both
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the Shift and Ctrl keys at the same time.
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4 When I pressed the Ctrl key with a character key, the small box would appear.
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From these observations, I made the hypothesis that ASCII control characters could be produced using the Ctrl key and character keys. I further made the hypothesis that the YAP-II s instruction-processing code was not ltering out these characters properly. To test out the rst hypothesis, I disconnected the YAP-II from the PC s serial port and shorted together the receive and transmit lines (pins 2 and 3). I discovered that when I pressed Ctrl along with a character key, the box would be displayed on the hyperterminal window, as it did with the YAP-II. This led me to assume that ASCII control characters were being generated. I then made up a stimulus le for the application and tried passing ASCII control characters (hex values less than 0x020) to the code to see what happened. When I did this, I found that the lter I had put in place didn t seem to be working correctly. At this point, I felt that I had identi ed the problem and was ready to start looking at different xes for it. This example probably seems trite and pretty obvious, but this is the basic point to following a structured approach to nding and eliminating problems. When you go through the process I outline here, you will nd that xing virtually all problems is very simple and forehead slapping obvious when you work through it. This is not to say that it is the case for all problems, but if you go through this process of characterizing and hypothesizing about the problem, you can now talk to an expert about the problem without feeling like you are potentially wasting his or her time. I know of very few people who will not spend a few minutes explaining what a problem is if the upfront work is done to characterize what is actually happening. With my ooding basement, I accepted the hypothesis from the builder I talked to that the drainpipe at the base of the house was no longer working correctly. This is a common problem for houses over 50 years old. To test this hypothesis, I poured water against houses that were a similar age to mine and found that the water didn t seem to drain and formed puddles against the wall of the house. I then performed the same experiment on a brand-new house and found that the water drained quickly and did not form any kind of standing water.
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At this point, you understand how the system is supposed to work, have characterized the problems, have hypothesized about what is the cause of the problem, and can start proposing some corrective actions. For most problems, if you have followed the process steps just described, you won t have any problem specifying an ef cient corrective action that will not cause other problems in the application. You may have some problems, however, when there are multiple solutions available for you to choose from, there are no obvious solutions, or the solutions will cause other problems in your application. In this section I will suggest some points for nding the best corrective action for your problem. I would argue that every problem has multiple solutions, and when I have helped out in high school classrooms, I suggest to the students that when they are faced with a problem, they should list three different possible corrective actions. This is often not easy to do, but when you do it, you will start thinking about what is the best approach for your problem. If you force yourself to come up with three solutions, you naturally will tend to create one that is obvious and will seem to you to be the best solution, the next solution will tend to be very simple, and the last one will be very complex and require a lot of effort. The interesting thing about this technique is that there will be cases where the best corrective action could be any one of the three proposed solutions, which means that you have a variety of choices and you are more likely to make the right one. When proposing different corrective actions, you might want to create a table such as Table 14.1, in which I have listed three different possible solutions to the problem of my ooded basement, along with different criteria that will in uence the decision regarding which is the best solution. When you review this table, the different criteria for selecting the best solution should be pretty obvious. Note that by properly documenting the expected state of the system and being able to identify the symptoms of the problem (water pooling at the side of the house), you can simply and clearly state whether or not you expect the proposed solution to work. A table such as this also lets you note various other issues that aren t related to the problem but will in uence your decision. In this case, I had to consider our two Siberian huskies that live out in our back yard if you are familiar with huskies, you will know that they are rambunctious and destructive dogs, which means that any work being done in the backyard will require the dogs to be either tied up (if it is short-term work) or put in kennels (expensive and unpleasant for the dogs). Furthermore, I have two young daughters who play in the backyard, and the trench needed to x the weeping tiles would be a danger to them. In this case, the optimal solution is number 2, having some eaves trough specialists come in and make sure that no water comes from the eaves (and this includes adding heaters for winter when ice forming in the eaves would cause water to spill over and pool at the base of the house), as well as making a gentle slope away from the house to redirect any water that might pool there. My coworker decided on having a contractor dig up the side of her house and had the weeping tiles and drain pipe replaced. Her family did not have a dog in the backyard
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