Specifications

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Glossary
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system. A segment is the portion of a real mode address which specifies the fixed
base address to which the offset is applied.
Serial Host: A computer connected to another through a serial interface. Connected
together this way, one computer can execute a program remotely on the other “host”
computer.
Serial Port: A physical connection with a computer for the purpose of serial data
exchange with a peripheral device. The port requires an I/O address, a dedicated IRQ
line, and a name to identify the physical connection and establish serial
communication between the computer and a connected hardware device. A serial port
is often referred to as a COM port.
Shadow Memory: RAM in the address range 0xC000h through 0xFFFFFh used for
shadowing. Shadowing is the process of copying BIOS extensions from ROM into
DRAM for the purpose of faster CPU access to the extensions when the system
requires frequent BIOS calls. Typically, system and video BIOS extensions are
shadowed in DRAM to increase system performance.
Single In-Line Memory Module (SIMM): A small, rectangular circuit board on
which is mounted semiconductor memory ICs.
Standoff: A mechanical device, typically constructed of an electrically non-
conductive material, used to fasten a circuit board to the bottom, top, or side of a
protective enclosure.
Static Random Access Memory (SRAM): A semiconductor RAM device in which
the data will remain permanently stored as long as power is applied, without the need
for periodically rewriting the data into memory.
Symmetrically Addressable SIMM: A SIMM, the memory content of which is
configured as two independent banks. Each 16-bit wide bank contains an equal
number of rows and columns and is independently addressable by the CPU via twin
row address strobe registers in the DRAM controller.
Synchronous Expansion Bus (SEB): An extension of the EPC-30 local bus provided
for the purpose of convenient interface with a user-designed peripheral board. The
SEB operates at the speed of the CPU and provides an ISA-like interface to the
SVGA, PCM ATA, keyboard/mouse, and IDE controllers.
System Memory: See Conventional Memory.
 U 
User Editable Drive (UED): A feature of the EPC-30’s Phoenix PicoBIOS. When a
“User” type hard disk drive setting shows in the IDE Adapter Sub-Menu the BIOS
queries the hard disk drive for the purpose of retrieving disk geometry. If the hard
disk drive is capable of providing this information, the BIOS uses it to automatically
set up the drive for use with the system.
 V 