User's Manual

Glossary 237
program, you can return to the other application program and leave the TSR
program resident in memory for later use.
TSR programs can sometimes cause memory conflicts. When troubleshooting,
rule out the possibility of such a conflict by rebooting your computer without
starting any TSR programs.
UART
Acronym for universal asynchronous receiver transmitter, the electronic circuit
that makes up the serial port.
UDP
Acronym for user datagram protocol.
UL
Abbreviation for Underwriters Laboratories.
UMB
Abbreviation for upper memory blocks.
unicode
A fixed width, 16-bit world wide character encoding, developed and maintained
by the Unicode Consortium.
upper memory area
The 384 KB of RAM located between 640 KB and 1 MB. If the computer has an
Intel386 or higher microprocessor, a utility called a
memory manager can create
UMBs in the upper memory area, in which you can load device drivers and
memory-resident programs.
UPS
Abbreviation for uninterruptible power supply. A battery-powered unit that
automatically supplies power to your computer in the event of an electrical failure.
USB
Abbreviation for Universal Serial Bus. A USB connector provides a single
connection point for multiple USB-compliant devices, such as mice, keyboards,
printers, and computer speakers. USB devices can also be connected and
disconnected while the system is running.