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Figure 12-6 is a photo of the completed LED display (version 2) installed on my 20X2 master processor board and running the MAXhelp20X2bas program that we are about to discuss (There is a piece of red plastic on top of the display because it photographed better that way) To connect the display to the 20X2, refer to the pin-outs for H3 and H4 that are shown in the schematic of Figure 12-3 (In the photo, you can t see the power connections to H3 because they are behind the board) If you refer to the 20X2 pin-out presented back in 7 (Figure 7-1), you will see that pin 9 of the 20X2 is its hspi sdo pin (sdo stands for serial data out) and pin 11 is the hspi sck pin (sck stands for serial clock), so they need to be connected to the 7219 s DIN pin and CLK pin, respectively We can use any output we want to connect to the 7219 s LOAD pin I used C2 (pin 8) To test the completed display board, we re going to run the MAXhelp20X2bas program in Listing 12-1 It takes advantage of the 7219 s BCD decoding to display the word HELP on the LEDs The program is thoroughly commented, but the hspisetup command does require a brief explanation The complete syntax for the command is hspisetup mode, spispeed If you read the hspisetup documentation in Part II of the manual, you ll see that several values can be used for the mode parameter However, they all refer to different options for the reception of SPI data Since the 7219 doesn t send any data back to the master processor, it doesn t matter which value we use, so I just chose the first one (spimode00) The spispeed parameter accepts one of three different.

A processor to do the thinking Input devices that allow you to enter information into the system Output devices that present the results of processing to you Storage devices that allow permanent storage of digitized information

12 Insert resistor R1 Solder and snip its leads 13 Insert headers H3 and H4 14 Flip the board over and support it on a flat

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I use information in its broadest sense that is, anything that can be entered into or extracted from a PC Information can be textual material, data, still images, video images, audio, or anything else that can be digitized, such as sensor data from a home security system Personal computers come in a variety of shapes and sizes, including wearable PCs, handheld PCs, tablet PCs, notebook PCs, and desktop PCs Our focus will be on the most popular and capable of the bunch, the desktop PC and notebook PC (see Figure I-2) Desktop PCs outsold notebook PCs until early in 2003 Now, notebook PCs (or laptop PCs) outsell desktop PCs Modern notebook PCs offer desktop-level performance, so expect this trend to continue We will always pay a premium for the portability of a notebook PC because it s simply more expensive to manufacture miniature components that are capable of withstanding mobile abuse A variety of the input/output hardware devices can be attached to either of these types of PCs, including printers, scanners, digital video cameras, and others that will be introduced later in the book

surface Make sure the lead from D13 touches the header pin at C13 Solder the five header pins and the lead at D13

The HAVING clause is similar to the WHERE clause, in that it is used to define a filter condition to limit records used in the GROUP BY clause Records that do not satisfy the WHERE conditions are not processed by the GROUP BY clause The HAVING clause filters the records contained in the result set after the GROUP BY clause groups the records

Figure I-2

of H3 and H4 Use a small spring clamp to hold each header and jumper tightly against the board, and solder and snip the leads

(Photos courtesy of Gateway, Inc)

16 Insert capacitor C Solder and snip its leads 17 Snip or remove pin 24 from the IC socket 18 Insert the socket and solder all its remaining pins 19 Insert capacitor C1 (The positive lead should

The Set Operation clauses use mathematical set theory to determine the result set of two separate SELECT commands The Set Operation clause types are: UNION Display all result set records in both select1 and select2 INTERSECT Display only result set records that are in both select1 and select2 EXCEPT Display only result set records that are in select1 but not in select2 By default, duplicate records in the output set are not displayed The ALL keyword is used to display all records from the output, including duplicate records The set operation is performed on the result sets of the SELECT commands The result sets must have the same number of columns, and the columns must have the same data types

Hardware can be exceedingly complex, but unless you plan to build or repair hardware, you can bypass these complexities and go directly to personal computing

if you prefer to solder it directly to the board) Flip the board over, support it on a flat surface, and solder all the pins

jumper that spans from R14 to T14 Using a small spring clamp to hold it in place, solder it at R14 and T14

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