Download All-in-one A+ certification exam guide by Michael Meyers PDF

By Michael Meyers

Mike Meyers has performed it back. the number 1, best-selling learn consultant for CompTIA's A+ Certification checks has been thoroughly revised and up to date for the recent 2001 assessments. Written by way of the industry's prime authority on A+ Certification, this must-have reference bargains whole assurance of all fabric on either the middle and working approach applied sciences tests. Plus, the bonus CD-ROM includes 6 perform exams, countless numbers of questions, and LearnKey(tm) videos. This entire consultant not just is helping you move the A+ certification checks, but additionally teaches you ways to be knowledgeable technician.

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If you installed the DRAM correctly, the RAM count on the PC will reflect the new value. If the RAM value stays the same, you probably have a disabled bank or the RAM is not properly installed. If the computer does not boot and there is nothing on the screen, you probably have not installed all the RAM sticks correctly. Usually a good second look is all you need to determine the problem (Figure 03-57 & Figure 03-58). Figure 57: RAM count before booting 61 Figure 58: RAM count after booting All RAM counts listed when your PC boots are based on units of 1024 bytes (1KB).

ECC is a major advancement in error checking on DRAM. As mentioned earlier, DRAM rarely goes bad anymore, but it can still have the occasional "hiccup" that can cause data loss. ) Parity is virtually useless for these types of occasional problems, but ECC detects problems in RAM quite well and can fix most of them on the fly. Any size RAM stick can use ECC DRAM, but it is most common as 168-pin DIMMs. In order to take advantage of ECC RAM, you need a motherboard that is designed to use ECC. Check your motherboard book.

EDO RAM was on either a 72-pin SIMM or a DIMM (168 or SO), and looked exactly like regular DRAM. There was no standard way to tell EDO from FPM DRAM, so again we were always careful to label our EDO RAM as such (Figure 03-47). Figure 47: How to tell EDO from FPM - another label You wanted to use EDO whenever possible. Unfortunately, you couldn't just put EDO RAM in any computer. In order to take advantage of EDO, you needed a chipset designed to handle EDO. The majority of the early Pentium systems used EDO RAM, but that was not true of the 486s with 72-pin SIMM slots.

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