- PC - Buzz - 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z *
- PC - Buzz - 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z *
| UAE = Unrecoverable Application Error UART = Universal Asynchronous Reciever Transmitter UAWG = Universal ADSL Working Group UCE = Unsolicited Commercial Email UCITA = Uniform Computer Information Transaction ACT UDP = User Datagram Protocol UHF = Ultra High Frequency UI = User Interface UKUSA Ultra-ATA Ultra-DMA Ultrix UMTS = Universal Mobile Telecommunications System UNC = Uniform Naming Convention Unicode UNIX UPS = Uninterruptible Power Supply URL = Uniform Resource Locator URN = Uniform Resource Name USB = Universal Serial Bus Usenet UTC = Universal Time Coordinated UTP = Unshielded Twisted Pair UUCP = Unix to Unix Copy Program UUdecode, UUencode |
Ultra High Frequency = UHF Uniform Computer Information Transaction ACT = UCITA Uniform Naming Convention = UNC Uniform Resource Locator = URL Uniform Resource Name = URN Uninterruptible Power Supply = UPS Universal ADSL Working Group = UAWG Universal Asynchronous Reciever Transmitter = UART Universal Mobile Telecommunications System = UMTS Universal Serial Bus = USB Universal Time Coordinated = UTC Unix to Unix Copy Program = UUCP Unrecoverable Application Error = UAE Unshielded Twisted Pair = UTP Unsolicited Commercial Email = UCE User Datagram Protocol = UDP User Interface = UI |
| 8250 | 8088 PCer | |
| 16450 | 80286 PCer | |
| 16550 | med 16 byte memory (FIFO buffer). 80386.. PCer | |
| 16650 | med 32 byte buffer |
\\computername\sharepoint \\server\images COPY \\SERVER\IMAGES\*.JPG C:\MYIMAGES \\server\images is assigned the driveletter Z COPY Z:\*.JPG C:\MYIMAGES uanset hvilket sprog.
Grundlæggende set beskæftiger computere sig udelukkende med tal. De arkiverer bogstaver og andre skrifttegn ved at tildele et tal til hvert enkelt tegn. Før Unicode blev opfundet, var der hundredvis af forskellige indkodningssystemer beregnet til at tildele disse tegn tal. Der fandtes ikke nogen indkodning, der kunne rumme nok skrifttegn: F.eks. har Den Europæiske Union brug for flere forskellige indkodninger til at dække alle sine sprog. Selv for ét enkelt sprog som engelsk fandtes der ikke nogen indkodning, der rakte til alle bogstaverne, tegns tningstegnene og de tekniske symboler i almindelig brug.
Disse indkodningssystemer kommer også i konflikt med hinanden. Det vil sige, at to forskellige indkodninger kan bruge det samme tal til to forskellige skrifttegn, eller de kan bruge forskellige tal til det samme skrifttegn. Alle computere (især servere) har behov for at kunne understøtte mange forskellige indkodninger; alligevel risikerer data altid at blive korrumperet, når de sendes mellem forskellige indkodninger eller platforme.
Unicode ændrer hele situationen!
Unicode tildeler hvert enkelt skrifttegn et unikt tal, uanset hvilken platform, uanset hvilket program, uanset hvilket sprog. De førende inden for industrien, bl.a. Apple, HP, IBM, JustSystem, Microsoft, Oracle, SAP, Sun, Sybase, Unisys og mange andre, har adopteret Unicode-standarden. Unicode forlanges af moderne standarder såsom XML, Java, ECMAScript (JavaScript), LDAP, CORBA 3.0, WML, etc., og det er den officielle måde at implementere ISO/IEC 10646 på. Det understøttes i mange operativsystemer, alle moderne browsere og mange andre produkter. Fremkomsten af Unicode-standarden og tilgængeligheden af værktøj, der understøtter den, er blandt de væsentligste nyere udviklinger inden for global software-teknologi.
Når Unicode inkorporeres i klient/server eller multi-lagsprogrammer og i websteder, giver det væsentlige besparelser sammenlignet med brugen af legacy-skrifttegnsæt. Unicode gør det muligt at anvende ét bestemt software-produkt eller ét bestemt websted på tværs af mange forskellige platforme, sprog og lande uden yderligere rekonstruktion. Det gør det muligt at transportere data gennem mange forskellige systemer, uden at de ødelægges.
The Unicode Consortium: www.unicode.org
sun.s-gms.ms.edus.si/usail : USAIL, Unix System Administration Independent Learning
[Techweb] Backup power used
when the electrical power fails or drops to an unacceptable voltage level. Small UPS
systems provide battery power for a few minutes; enough to power down the computer in an
orderly manner. Sophisticated systems are tied to electrical generators that can provide
power for days.
A UPS system can be connected to a file server so that, in the event of a problem, all
network users can be alerted to save files and shut down immediately.
An online UPS provides a constant source of electrical power from the battery, while the
batteries are being recharged from AC power. An offline UPS, also known as a standby power
system (SPS), switches to battery within a few milliseconds after detecting a power
failure.
The line interactive UPS is a hybrid of the online and standby units. Like the standby
unit, it does not constantly draw from the battery, but it switches over to the battery
faster when required. In addition, it does not switch to battery when it encounters low
voltages. It uses extra power from the the AC source to make up the difference instead.
A surge protector filters out surges and spikes, and a voltage regulator maintains uniform
voltage during a brownout, but a UPS keeps a computer running when there is no electrical
power. UPS systems typically provide surge suppression and may also provide voltage
regulation.
UPS - Now More Than Ever In order to improve performance, computers are increasingly using
write back caches, which means that updated data intended for the disk is temporarily
stored in RAM. If a power failure occurs, there is more of a chance that new data will be
lost, thus UPS systems are becoming important for all computers.
rfc.sunsite.dk/rfc/rfc1738.html
: URL
http://www.canyon-view.com/courses/bwd/url.html
http://www.blooberry.com/indexdot/html/topics/urlencoding.htm : % codes
[Techweb] (Universal Serial Bus)
A hardware interface for low-speed peripherals such as the keyboard, mouse, joystick,
scanner, printer and telephony devices. It also supports MPEG-1 and MPEG-2 digital video.
USB has a maximum bandwidth of 12 Mbits/sec (equivalent to 1.5 Mbytes/sec), and up to 127
devices can be attached. Fast devices can use the full bandwidth, while lower-speed ones
can transfer data using a 1.5 Mbits/sec subchannel. USB's hot swap capability allows
everything to be plugged in and unplugged without turning the system off. USB ports began
to appear on PCs in 1997, and Windows 98 fully supports it.
Devices are plugged directly into a four-pin socket on the PC or into a multi-port hub
that plugs into the PC or into a device that also functions as a hub for other devices.
The USB bus distributes 0.5 amps (500 milliamps) of power through each port. Thus,
low-power devices that might normally require a separate AC adapter can be powered through
the cable. Hubs may derive all power from the USB bus (bus powered), or they may be
powered from their own AC adapter. Powered hubs with at least 0.5 amps per port provide
the most flexibility for future downstream devices. Port switching hubs isolate all ports
from each other so that one shorted device will not bring down the others.
USB ports on the PC and hubs use a rectangular Type A socket. All cables that are
permanently attached to the device have a Type A plug. Devices that use a separate cable
have a square Type B socket, and the cable that connects them has a Type A and Type B
plug.
USB Connections Hubs can be stand-alone units or built into the monitor, which makes it
easier to connect the keyboard, mouse and other devices. The thin Type A sockets are used
on the PC and hubs. Type B sockets are on the input side of hubs and on peripherals that
have separate cables.
> FireWire
version 1.0 kom i januar 1996
USB Implementers Forum dannedes i 1994
UTC is;
equal to time at longitude 0° ± 7.5°,
equal to time in Greenwich, England,
5 hours ahead of EST (CDT),
6 hours ahead of CST (MDT),
7 hours ahead of MST (PDT),
8 hours ahead of PST.
EST- Eastern Standard Time, CDT- Central Daylight savings Time,
CST- Central Standard Time, MDT- Mountain Daylight savings Time,
MST- Mountain Standard Time, PDT- Pacific Daylight savings Time,
PST- Pacific Standard Time.