Apple Desktop Computer manual Nmi

A P P E N D I X A

Abbreviations

NMI	nonmaskable interrupt
NV-RAM	nonvolatile random-access memory
OHCI	Open Host Controller Interface
OS	operating system
PCI	Peripheral Component Interconnect, an industry-standard
	expansion bus
PLL	phase-locked loop
POST	power-on self test
RAM	random-access memory
RAID	random array of inexpensive disks
RCA	Radio Corporation of America
rms	root mean square
ROM	read-only memory
RTAS	run-time abstraction services
SCC	Serial Communications Controller
SCSI	Small Computer System Interface
SDRAM	synchronous dynamic RAM
SGRAM	synchronous graphics RAM; used for display buffers
SNR	signal to noise ratio
SO-DIMM	small outline dual inline memory module
SPD	Serial Presence Detect, a feature of the SO DIMM
USB	Universal Serial Bus, an industry-standard
	expansion bus
VCC	positive supply voltage (voltage for collectors)
VIA	versatile interface adapter

71