Dell OptiPlex N Troubleshooting Manual page 126

Abbreviation
or Acronym Description
UL Underwriters Laboratories
UMB upper memory block
UPS uninterruptible power supply
USB universal serial bus
USOC Universal Service Ordering Code
V volt(s)
VAC volt(s) alternating current
VDC volt(s) direct current
VDE Verband Deutscher
Elektrotechniker
VESA Video Electronics Standards
Association
VGA video graphics array
VLSI very-large-scale integration
VRAM video random-access memory
W watt(s)
WH watt-hour(s)
XMM extended memory manager
XMS eXtended Memory Specification
ZIF zero insertion force
4 Diagnostics and Troubleshooting Guide