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1998-06-10
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85 lines
"The Atari A to Z"
by Mark S Baines
Copyright (c) 1998 Mark S Baines
All Rights Reserved
YOU MUST READ "READ_ME.NOW" BEFORE YOU LOOK AT ANY OF THIS FILE
*****************************************************************************
X
X number
Such as X.25. A series of CCITT Recommendations concerning public data
networks, PAD facilities and their interfaces.
XBIOS
eXtended BIOS. The machine-specific extension to the BIOS that supports the
special hardware features of the ST-Falcon range, being the lowest level of
access in TOS to the hardware. Interfacing is provided to the RS-232C port,
the disk drive, sound, video SHIFTER and BLiTTER chips, keyboard etc. There
are no naming consistencies with XBIOS functions, unlike GEMDOS and BIOS.
XBRA
A protocol for writing TOS-based programs that install vectors at certain
memory locations (usually system variables and exception vectors in low
memory) which are intercepted and the routine pointed to by that vector
executed. The protocol ensures that any vector already installed at that
location is stored by the program so that when it has finished it can pass
control to the old vector thus giving that routine a chance of execution. In
this manner a chain of vectors is maintained by compliant programs.
XCONTROL panel
eXtensible CONTROL panel. The Control Panel accessory designed for TOS 2 and 3
but capable of being used on other TOS versions. The program takes up one
accessory slot but has the capability of loading up many separate CPX modules
each performing a specific task, such as formatting a disk, providing a
calendar or setting the Desktop colours. This overcomes the problem of limited
accessory space and provides a uniform style for the CPX accessories.
XGA
eXtended Graphics Array. A screen display format found on the IBM PC
compatibles which offers a resolution of 1,024 x 678 pixels with 256 colours.
Xmodem
An almost universal data transfer protocol enabling the transfer of files
between remote computers. It uses small blocks of data, typically 256 bytes
although a 1 K version is now common. The original 1-byte checksum version was
replaced by a 2-byte cyclical redundancy check (CRC-16) version to provide
modern error detection protection. See Ymodem, Zmodem.
XNAM
A protocol similar to that for the XBRA protocol except that the old vector is
not stored by any vector grabbing program. It is used as an identification
header to programs running under interrupts (usually VBLs) that do not need to
be chained.
XT
eXtended Technology. An IBM PC computer launched in 1983 as an upgrade of the
original IBM PC. It had 640 K of memory and a 10 Mb hard disk.
X Window
A network transparent window system for the UNIX operating system developed by
MIT in the late 1980s and available on the TT as part of its UNIX system. See
TT UNIX workstation.
XY plotter
A flatbed plotter on which the pen is controlled in two dimensions and the
paper does not move.
X
10 entries
EOF