Com 226 comp trouble shooting II theory book



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com-226-computer-troubleshooting-ii-theory
SIMMs and DIMMs: By the time 386 systems took hold in the PC industry, proprietary memory modules had been largely abandoned in favor of the Memory Module (Fig. 23-
3). A SIMM (Single Inline Memory Module) is light, small, and contains a relatively large block of memory, but perhaps the greatest advantage of a SIMM is standardization. Using a standard pin layout, a SIMM from one PC can be installed in any other PC. The pin
SIMM (Table 23-1) provides 8 data bits, and generally holds up to MB of RAM.
The 30-
748 Memory Troubleshooting

A pin SIMM A pin DIMM
ATA AND TROUBLESHOOTING
Memory Organization
The memory in your computer represents the result of evolution over several computer generations. Memory operation and handling is taken care of by your system’s microprocessor.

As CPUs improved, memory-handling capabilities have improved as well. Today’s microprocessors, such as the Intel Pentium or Pentium Pro, are capable of addressing more than GB of system memory—well beyond the levels of contemporary software applications. Unfortunately, the early PCs were not nearly so powerful. Older PCs could only address MB of memory because of the limitations of the 8088 microprocessor. Because backward compatibility is so important to computer users, the drawbacks and limitations of older systems had to be carried forward into newer computers, instead of being eliminated. Newer systems overcome their inherent limitations by adding different types of memory, along with the hardware and software to access the memory. This part of the chapter describes the typical classifications of computer memory conventional, extended, and expanded memory. This chapter also describes high memory concepts. Notice that these memory types have nothing to do with the actual ICs in your system, but the way in which software uses the memory.

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