Topic       : TOS - The Operating System
Author      : 
Version     : tos.hyp (December 19, 2008)
Subject     : Programmieren/Atari
Nodes       : 3010
Index Size  : 93790
HCP-Version : 5
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : Title
@help       : 
@options    : +g -i -s +x +zz -t4
@width      : 70
View Ref-File4.5.6  EsetGray                                                    TOS

 Name:         »Set/clear gray mode« - Switches on or off the colour 
               interpretation in the video shifter.

 Opcode:       86

 Syntax:       int16_t EsetGray( int16_t switch );

 Description:  The XBIOS routine EsetGray switches on (1) or off (0) 
               the colour interpretation in the colour table as a 
               greytone. A negative value returns the grey bit of the 
               video shifter but does not alter the setting.

               In greytone mode one can select from a palette of 256 
               greytones (0-255) instead of 4096 colours (RGB 0-15).

 Return value: The function returns the previous value of the video 
               shifter's grey bit.

 Availability: The function is available only in the TOS of the Atari 
               TT (when the high word of the '_VDO' cookie has the 
               value of 2).

 Group:        Screen functions

 See also:     Binding