Apple IIe - Page 233

Apple lie Graphics 233
be replaced with 32 more rows of the graphics mode to increase
the display resolution to 280x192 pixels. This is accomplished in
the same manner as was a similar switch using low resolution
graphics.
POKE 49234,0
POKE 49235,0
full
screen graphics
graphics+ text
(no erase)
A second high resolution command is:
HGR2
set high resolution graphics only.
This
command clears then displays high resolution page 2. Page 2
is located at memory addresses 4000-6000 Hex. Use of this com-
mand has one advantage over HGR - more memory space is
available for program use. HGR2 has the disadvantage that it
does not easily support a graphics plus text display. As a side note
- if the command GR is issued while HGR2 is in effect , low
resolution page 2 will be displayed. BASIC does not support this
display
mode. Enter TEXT to recover from this error.
An HCOLOR command must be used before any graphics may
be output to the high resolution display. This command selects
the color that will be displayed next. The correct syntax of this
command is as follows:
HCOLOR =x
x represents a number between 0 and 7. Each number corres -
ponds to a specific color. This information is contained in Table
6-2.
0- black
1-
green
2- purple
3- white
Table 6-2.
4- black
5-
orange
6- blue
7- white