Atari XL User Manual

Graphics 145
Player-Missile graphics (see Chapter 15). These
registers are memory locations 704, 705, 706 and
707, and cannot be set using SETCOLOR; instead
you must use PO KE to place a value for colour and
luminance into the register. The value to use is:
(Colour Number * 16) + Luminance
Eight of the nine colours can then be selected by
the ninth sets the colour of the border of
the screen and can not be used for drawing. The
registers and their CO LO R codes are:
COLOR No.
°
1
2
3
4
5
6
7
Border
Mode 11
Register
Location 705
Location 706
Location 707
Colour Register 0
Colour Register 1
Colour Register 2
Colour Register 3
Colour Register 4
Location 704
This mode is the (opposite' of mode 9, giving sixteen
colours but only one luminance, instead of one
colour at sixteen luminances. The resolution is
again 192 rows of 80 columns, and the text window
is once again unavailable.
To control the colours you must first set the colour-
in register 4 to 0, or the full set of sixteen colours
will not be displayed. The colours are selected
using COLOR and the colour number.
This example program draws the Atari logo in
sixteen colours on a mode 11 display.

Atari XL Specifications

General

Release Year	1983
CPU	MOS Technology 6502C
Graphics	ANTIC, GTIA
Sound	POKEY (4 channels)
Storage	Cassette tape
Ports	Cartridge
Operating System	Atari BASIC
CPU Speed	1.79 MHz
RAM	64 KB