By Michael Meyers
Mike Meyers has performed it back. the number one, best-selling examine advisor for CompTIA's A+ Certification tests has been thoroughly revised and up to date for the recent 2001 tests. Written by means of the industry's prime authority on A+ Certification, this must-have reference bargains entire insurance of all fabric on either the middle and working process applied sciences tests. Plus, the bonus CD-ROM comprises 6 perform assessments, thousands of questions, and LearnKey(tm) movies. This accomplished advisor not just is helping you go the A+ certification assessments, but additionally teaches you the way to be a professional technician.
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So how could the 8088, with only an 8-bit external data bus, handle commands that were more than one byte wide? The answer was simple; it chopped the commands up into one-byte chunks. So every time the 8088 CPU ran into commands like these, it would have to access RAM at least twice before it could act on the command, due to its 8-bit external data bus. When the 286 CPUs arrived, an opportunity arose. Do you remember from Chapter 2 that a 286 had a 16-bit external data bus? With the right chipset, a 286 could access 16 bits every time memory was accessed.
This meant that for a 386DX or a 486 motherboard, you could replace four 30-pin SIMMs with one 72-pin SIMM. For a Pentium, you would need only two 72-pin SIMMs (Figure 03-42). Although similar to the 30-pin SIMM, the 72-pin SIMM is about an inch longer and has a distinct notch in the middle of the pins to assist in inserting the stick (Figure 03-43). Figure 42: 72-pin SIMM 51 Figure 43: 72-pin SIMM slots Since 72-pin SIMMs were 32 bits wide, the term "x 32" described a non-parity SIMM and "x 36" described a parity SIMM.
You can have differently sized SIMMs in different banks. For example, assuming you have a 486 system with two banks, you can install 4 x 8 SIMMs in one bank (16MB) and 1 x 8 SIMMs in another (4MB), for a total RAM amount of 20MB. ) Imagine how limited RAM installation would be if you didn't have multiple banks! Today, all systems have multiple banks for RAM. 50 Figure 41: Banks are cumulative The connectors where you install a bank are also collectively called a bank. A bank without any SIMMs is called an "unpopulated" bank and a bank filled with SIMMs is called a "populated" bank.
All-in-one A+ certification exam guide by Michael Meyers