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Chapter 7 (Glossary)
Comptia A+ Guide to maintaining your PC, 7th Edition
27
Computer Networking
Undergraduate 1
04/02/2013

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Term
Burst EDO (BEDO)
Definition
A refined version of EDO memory that significantly improved access time over EDO. Was not widely used because Intel chose not to support it. Stored on 168-pin DIMM modules.
Term
CAS Latency
Definition
A method of measuring access timing to memory, which is the number of clock cycles required to write or read a column of data off a memory module.
Term
C-RIMM (Continuity RIMM)
Definition
A placeholder RIMM module that provides continuity so that every RIMM slot is filled.
Term
DDR2
Definition
A version of SDRAM that is faster than DDR and uses less power.
Term
DDR3
Definition
A version of SDRAM that is faster than DDR2 memory and that can use triple channels.
Term
Direct Rambus DRAM (Direct RDRAM) (Rambus)
Definition
A memory technology by Rambus and Intel that uses a narrow network-type system bus. Memory is stored on a RIMM module.
Term
Double Data Rate SDRAM
(DDR SDRAM, SDRAM II, DDR)
Definition
A type of memory technology used on DIMMs that runs at twice the speed of the system clock.
Term
double-sided
Definition
A DIMM feature whereby memory chips are installed on both sides of a DIMM.
Term
dual channels
Definition
A motherboard feature that improves memory performance by providing two 64-bit channels between memory and the chipset. Can be used by DDR, DDR2, and DDR3 DIMMs
Term
dual ranked
Definition
Double-sided DIMMs that provide two 64-bit banks. The memory controller accesses first one bank and then the other.
Term
ECC (error-correcting code)
Definition
A chipset feature on a motherboard that checks the integrity of data stored on DIMMs or RIMMs and can correct single-bit errors in a byte.
Term
EDO (extended data out)
Definition
A type of outdated RAM that was faster than conventional RAM because it eliminated the delay before it issued the next memory address.
Term
FPM (fast page memory)
Definition
An outdated memory mode used before the introduction of EDO memory. (Improved on earlier memory types by sending the row address just once for many accesses to memory near that row.)
Term
General Protection Fault (GPF)
Definition
A Windows error that occurs when a program attempts to access a memory address that is not available or is no longer assigned to it.
Term
memory bank
Definition
The memory a processor addresses at one time.
Term
parity
Definition
An error-checking scheme in which a ninth bit is added. The value of the bit is set to either 0 or 1 to provide an even number of ones for even ______ and an odd number of ones for odd ______.
Term
parity error
Definition
An error that occurs when the number of 1s in the byte is not in agreement with the expected number.
Term
RAS Latency
Definition
A method of measuring access timing to memory, which is the number of clock cycles required to write or read a row of data off a memory module.
Term
re-marked chips
Definition
Chips that have been used and returned to the factory, marked again, and resold. The surface of the chips may be dull or scratched.
Term
RIMM
Definition
A type of memory module developed by Rambus, Inc.
Term
SIMM (single inline memory module)
Definition
A miniature circuit board used in older computers to hold RAM. They hold 8, 16, 32, or 64 MB on a single module.
Term
single channel
Definition
The memory controller on a motherboard that can access only one DIMM at a time.
Term
single ranked
Definition
DIMMs that provide only one 64-bit bank. All memory chips on the DIMM are accessed at the same time.
Term
single-sided
Definition
Memory chips embedded on only a single side of a DIMM.
Term
SO-DIMM (small outline DIMM)
Definition
A type of memory module used in notebook computers that uses DIMM technology.
Term
synchronous DRAM (SDRAM)
Definition
A type of memory stored on DIMMs that runs in sync with the system clock, running at the same speed as the motherboard.
Term
triple channels
Definition
When the memory controller accesses three DIMMs at the same time.
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