HN440 USER’S GUIDE
G l o s s a r y 4 1
EIDE (Enhanced Integrated Drive Electronics). A standard
electronic interface for mass storage drives. EIDE’s
enhancements to the earlier IDE interface made it possible to
address hard disks larger than 528 Mbytes. EIDE also
provides faster access to the hard drive, support for Direct
Memory Access (DMA), and support for removable-media
drives (see ATAPI).
ECC (Error Checking & Correcting). A method of
detecting — and where possible correcting automatically —
errors in data that is being read or transmitted (in this context,
to or from memory).
EPP/ECP (Enhanced Parallel Port/Extended Capability
Port). EPP/ECP is a standard signalling method for bi-
directional parallel communication between a computer and
peripheral devices, that offers the potential for much higher
rates of data transfer than the original parallel signalling
methods. EPP is for non-printer peripherals. ECP is for
printers and scanners. EPP/ECP are part of IEEE Standard
1284.
ISA (Industry Standard Architecture). ISA is a standard
bus architecture associated with the original IBM AT
motherboard. Although superseded technologically, many
expansion cards continue to use it.
logic-controlled Power Supply Unit (PSU). Also known as
a “soft-switch” PSU. A PSU that is controlled by a
combination of firmware/software and which is capable of
supplying current to a +5 V standby rail. Such a PSU
facilitates sophisticated power-saving modes, and features
such as Wake-on-LAN (q.v.). The system’s Power button is
connected to the motherboard rather than providing a direct
mechanical coupling to the PSU itself. See also ACPI.
OLGA. See SECC2.
PC66, PC100. Specifications from Intel for SDRAM (see
below) designed to operate at 66 MHz and 100 MHz
respectively.
PCI (Peripheral Component Interconnect). PCI is an
interconnection system between a microprocessor and
attached devices, including motherboard devices and