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Abbreviations

When unusual abbreviations appear in this developer note, the corresponding terms are also spelled out. Standard units of measure and other widely used abbreviations are not spelled out.

Here are the standard units of measure used in developer notes:

A amperes mA milliamperes
dB decibels \xB5A microamperes
GB gigabytes MB megabytes
Hz hertz MHz megahertz
in. inches mm millimeters
k 1000 ms milliseconds
K 1024 \xB5s microseconds
KB kilobytes ns nanoseconds
kg kilograms ohms
kHz kilohertz sec. seconds
k kilohms V volts
lb. pounds W watts



Other abbreviations used in developer notes include these:

ADC Apple digital connector
AGP accelerated graphics port
ATA advanced technology attachment
ATAPI advanced technology attachment, packet interface
AV audiovisual
CAS column address strobe
CD-ROM compact disc read-only memory
DBDMA descriptor-based direct memory access
DDC display data channel
DIMM dual inline memory module
DIN Deutsche Industrie Norm
DMA direct memory access
DRAM dynamic random-access memory
DVD 12 cm optical storage system with 4 GB capacity
DVD-ROM DVD read-only memory
DVD-RAM DVD that is both readable and writeable
DVI Digital Visual Interface
EDO extended data out DRAM device type
EIDE extended IDE
EMI electromagnetic interference
ESDRAM enhanced synchronous dynamic random-access memory
FWIM FireWire interface module
G3 Generation 3, the third generation of PowerPC
microprocessors, including the PPC 740 and PPC 750
G4 Generation 4, the fourth generation of PowerPC
microprocessors, incorporating AltiVec technology
HID human interface device, a class of USB devices
I2 C same as IIC
I2 S same as IIS
IC integrated circuit
IDE integrated device electronics
IEEE Institute of Electrical and Electronics Engineers
IEEE 1274 the official specification for Open Firmware
IEEE 1394 the official specification for FireWire
IIC inter-IC (an internal control bus)
IIS inter-IC sound bus
I/O input/output
ISO International Organization for Standardization
JEDEC Joint Electronics Devices Engineering Council
L2 level 2 (refers to level of cache)
L3 level 3 (refers to level of cache)
LAN local area network
MAC media access controller
Mac OS Macintosh Operating System
PCI Peripheral Component Interconnect
PHY physical layer
PIO polled input/output
RAM random-access memory
RAS row address strobe
RBC reduced block commands
RGB a video signal format with separate red, green, and blue components
RISC reduced instruction set computing
ROM read-only memory
SBP Serial Bus Protocol
SCSI Small Computer System Interface
SCC serial communications controller
SDRAM synchronous dynamic random access memory
SRAM static random access memory
USB Universal Serial Bus
TMDS transition minimized differential signaling
VESA Video Electronics Standards Association
VRAM video RAM; used for display buffers


Copyright © 2001 Apple Computer, Inc. (Last Updated January 2, 2001)

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