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unaffected by the outpinsB statement Of course, you can also write to individual outputs (eg, high B7), which is often easier than using this function of an outpins variable The second use of the two outpins variables is to read the current value of the valid output pins In this case, the outpins variable is placed on the right side of the assignment statement Therefore, executing b0 outpinsB will transfer the current pin values of the portB outputs to the variable b0 If you use this approach, it s again important to extract the valid pin data from the extraneous data see the manual for details However, you can also access the level of individual output pins by simply using the valid bit variables of the outpins variable (eg, if outpinB6 1 then ), which is frequently all that s needed In the project for this chapter, we ll actually connect eight LEDs to portB of the 20M2, so at that point you may want to experiment with outpinsB and observe the results

Table 1-2

OutpinsB and outpinsC have a similar structure to that of pinsB and pinsC in that they are each composed of eight separate pin variables for example, outpinsB outpinB7 : outpinB6 : outpinB5 , etc; also, only valid output pin variables are actually implemented Both the outpins variables can be used in two different ways To write to the outputs, simply place the outpins variable on the left side of an assignment statement For example, outpinsB b0 will transfer the bit values of variable b0 to the output pins It s important to remember that only valid output pins will be affected For example, consider the pin-out of the PICAXE-20M2 processor shown earlier in Figure 4-4 Suppose there are eight LEDs with currentlimiting resistors connected to portB and the following code snippet has just been executed:

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The bus width refers to the number of bits that can be handled as a unit Most modern processors have a bus width of 32 bits, but some processors have made the jump to a 64-bit bus Like processors, bus speed is rated in MHz and GHz Modern PCs have processors with bus speeds ranging from 400 to 800 MHz That s fast, but not fast enough Bus speed has long been the bottleneck for PCs because processor clock speed continues to outpace bus speed A typical processor might be described as a 32-bit 34 MHz processor with a bus speed of 800 MHz

dirsB = %11110000 outpinsB = %11111111

The getitemswonc program starts off as usual, connecting to the sample database and using the PQexec() function to send a simple query The number of records in the result set is obtained using the PQntuples() function, and a for loop is started to loop through the result set records

It s helpful to understand the various types of memory in a PC because every time you purchase or upgrade a PC, you have to deal with a memory trade-off: system performance versus cost The amount of memory in a PC can have a dramatic effect on overall system performance and/or your bank account A memory upgrade can add from $50 to $500 to the cost of a PC Depending on your personal computing objectives, the extra cost could be well worth the money Frequently, people buy a PC within their current budget and then add RAM later It s an easy upgrade if you understand that all you have to do is slip a RAM module into a DIMM slot Read on

I have saved the most powerful (and most complicated) special-function variables until last Earlier in this chapter (in the Storage Variables section) we discussed the use of the peek and poke commands to access the data in the memory storage area That approach is known as direct addressing because we are directly accessing the data that is stored at a specific location There is a second approach to data access, known as indirect addressing, which uses a data structure known as a pointer because it points to the data in which we are actually interested At first glance, this may seem unnecessarily complicated, but it provides a much more flexible and powerful method of data storage and retrieval In 10 we re going to use indirect addressing to implement a serial LCD display; for

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