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Most of the objectives on the CompTIA A+ exams don t require state-of-the-art hardware If you re willing to use systems that are a few years old, you can get plenty of good hands-on practice with the techniques you need to know to pass the CompTIA A+ Step 1 Go on a scavenger hunt Get a list of the smaller mom and pop PC repair companies and small PC parts suppliers in your town Drive to these companies (don t call them) and ask them, What do you guys do with your broken or obsolete parts The vast majority of these stores simply throw the parts away! Ask when they toss stuff and if you can have what they throw away Most of these companies pay to get rid of equipment and will be glad to give it to you Oh, and you can forget the big chain stores they almost never let folks have equipment Step 2 Shop the sale bins at the local computer parts stores You ll always nd one or two pieces of equipment at outrageously low prices Granted, you may end up using a bright pink Barbie keyboard, but if it only costs $3, who cares Don t forget about rebates you can often get parts for free after rebate! Really! Step 3 Tell everyone you know that you re looking for PC hardware Almost every organization will have occasional in-house sales where they sell older (but still good) PCs, printers, and so on to employees If you can get in on some of these, you ll have some amazing deals come your way!

PrintParamInfo( &myDVD, myDVD );

Here s the prototype for PrintParamInfo():

SATA ports ______________________________________________________ Onboard video chipset _____________________________________________ Other features ___________________________________________________ _______________________________________________________________

void PrintParamInfo( struct DVDInfo *myDVDPtr, struct DVDInfo myDVDCopy );

The first parameter is a pointer to main() s myDVD struct. The second parameter is a copy of the same struct. PrintParamInfo() prints the address of the rating field of each version of myDVD:

Instructions can be divided into four types Computational instructions perform arithmetic, logical, and shift operations on register operands They can employ the R-type format if all the operands and the result are registers, or the I-rype format if one of the operands is specified in the immediate field of the instruction

Now you get the real test of your tech skills: installing the new motherboards and reconnecting everything so that the computers work again! Don t be intimidated, though Everything you need to install a motherboard (in your case, probably the motherboard you just removed in Lab Exercise 706) is right in front of you

printf( "Address of myDVDPtr->rating in PrintParamInfo(): %p\n", &(myDVDPtr->rating) ); printf( "Address of myDVDCopy.rating in PrintParamInfo(): %p\n", &(myDVDCopy.rating) );

Here are the results, including the line of output generated by main():

Address of myDVD.rating in main(): 0xbffff559 Address of myDVDPtr->rating in PrintParamInfo(): 0xbffff559 Address of myDVDCopy.rating in PrintParamInfo(): 0xbffff4d4

Over the past few labs, you have concentrated on hardware removal and installation, using either the disassembled non-production system or a working non-production system or in some cases both It is very easy to become casual or even careless about technique and organization since these machines are noncritical One of the really important concepts to remember is that all of these efforts the studying, the labs, and the CompTIA A+ certi cation itself are designed to help you become the highestquality tech that you can be! It s very important that you develop and practice patience, attention to detail, and nesse while working through the lab exercises To this end, when you remove and replace a motherboard in a system, you interact with almost every component of the computer system In the eld, you must not only successfully disassemble/assemble the hardware, but also verify that the system powers up and operates properly afterward Many competent techs, when installing a new motherboard, will check for proper operation along the way Here s a good checkpoint: After you ve installed the CPU and RAM, con gured any jumpers or switches, and installed the motherboard in the case, insert the power connections and test the system A POST card is a real timesaver here, but you can also connect the PC speaker, a graphics card, monitor, and a keyboard to verify that the system is booting properly

Notice that the rating field accessed via a pointer has the same address as the original rating field in main() s myDVD struct. If PrintParamInfo() uses the first parameter to modify the rating field, it will, in effect, be changing main() s rating field. If PrintParamInfo() uses the second parameter to modify the rating field, main() s

Load/store instructions move data between the memory and registers They employ the I-type format The only addressing mode is the base register plus the signed offset stored in the immediate field Jump and branch instructions steer the control flow of the program Jumps are unconditional and use the J-type format to jump to an absolute address composed of the 26-bit target and the high-order 4 bits of the PC Branches are conditional and use the I-type format to specify the target address as the PC plus the 16-bit offset in the immediate field Other instructions in the instruction set are used to perform operations in the coprocessors and other special system functions Coprocessor 0 (CPU) is the system control coprocessor CPO instructions manipulate the memory management and exception handling facilities Floating-point instructions are implemented as coprocessor instructions and are performed by a separate floating-point processor