"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
*****************************************************************************


Z


Z80
A common 8-bit Zilog microprocessor, particularly used in old CP/M systems.


Z85C30
The Zilog 85C30 SCC.


Zero
The binary or decimal digit represented by '0' indicating the absence of a 
value or a 'false' result in a logic operation.


Zero-bit
A 0-bit, representing binary zero.


Zero divide
A processor exception that occurs when a program tries to divide something by 
zero. In mathematics and programming the result is undefined so after catching 
this error TOS normally returns control back to the program making the result 
random garbage. See Exception vectors, Bombs.


Zero insertion force - ZIF
A type of socket for integrated circuit devices in which a lever with a cam 
action is incorporated to permit a device to be inserted or removed without 
applying pressure to the pins. Often used in EPROM blowers.


Zero suppression
An operation to eliminate zeros that have no significance from numbers before 
they are displayed, e.g. to change 0001.200 to 1.2. Sometimes other characters 
are substituted, especially on machine printed cheques, as in ***1.2. This is 
a typical spreadsheet function.


ZIF
Zero Insertion Force.


ZIL
Zigzag In-Line. An integrated circuit package where alternate pins from a 
single row are bent in opposite directions to form a zigzag.


Zilog 85C30 SCC
A dual standard, multi-protocol data communications chip in a 44-pin PLCC 
package on the TT and Falcon providing two serial ports (A and B). It has an 
asynchronous transfer rate of about 250 Kbits per second and a synchronous 
rate of 1 Mbit per second. See SCC ports.


ZIP
A file compression format with the .ZIP file name extender. It has the 
advantages of processing files very quickly with large compression ratios, 
especially with the 'deflate' method.


ZIP
Zigzag In-Line Package. Synonymous with ZIL.


Zmodem
A data transfer protocol using Xmodem with CRC-16 or CRC-32 and Ymodem 
technology but providing greater reliability, throughput speed, file 
management and error recovery. Of particular importance is that any aborted 
file transfer can be resumed from the same point on another occasion.


ZOO
A file compression format with the .ZOO file name extender common on many 
systems especially IBM PCs and UNIX.


Zoom
In computer graphics, to change the size of all or part of the elements of a 
display, usually to magnify or enlarge.


Zoom box
See Full box.


Z
16 entries
EOF