Atari XL User Manual

144
The Ater! XL Handbook
background does not appear black when you select
this mode, but instead retains the colour of the
mode 0 screen.
Mode9
This mode, like mode 8, uses only one colour.
However, unlike any other display mode, this mode
gives 16 different luminances. The colour is
controlled by colour register 4, but the luminance
is controlled by the COLOR command and the
luminance set in register 4 has no effect. The
background is set to a luminance ofO.
The resolution in this mode is 192 rows of 80
columns. The text window may not be displayed in
this mode.
The example program shows all 16 luminances of
colour number 3 on the screen.
10 GRAPHICS 9
20 SETCOLOR 4, 3, 0
30 FOR LUM=O TO 15
40 COLOR LUM
50 FOR Z=O TO 11
60 PLOT 0, LUM*12 + 2
70 DRAWTO 79, LUM*12 + 2
80 NEXT Z
90 NEXT LUM
100 GOTO 100
Mode 10
This mode has a similar resolution to mode 9; 192
rows of 80 columns. Again the text window may
not be displayed. Nine colours are displayable,
each in eight luminances. Five of the colours are
specified by the colour registers, and can be set by
SETCOLOR, the other four are controlled by
registers which are usually reserved for use with

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