Topic       : The ATARI Compendium
Author      : Scott Sanders / JAY Software
Version     : 1.25 (20/6/2003)
Subject     : Documentation
Nodes       : 1117
Index Size  : 32614
HCP-Version : 6
Compiled on : Atari
@charset    : UTF-8
@lang       : en
@default    : 
@help       : %About
@options    : +g -i -t4 +y +z
@width      : 100
View Ref-File                                                                    C08
                                 Line-A


The Line-A portion of the operating system is so named because it uses
a special exception vector of 680x0 processors triggered when the first
nibble of the a command word is $A. On Atari systems this vector is routed
to the operating system ROMs and provides a low-level yet high-speed
graphics interface.

The Line-A system is included in this document for completeness only. It
is recommended that its use be avoided and that the counterpart VDI calls
be used instead. Atari has not guaranteed that it will maintain Line-A
compatibility in future systems. Its functionality has already been
limited as video capabilities have advanced beyond its design.


   ∙ The Line-A Variable Table
   ∙ Line-A Font Headers
   ∙ Line-A Function Calling Procedure
   ∙ Line-A Function Reference