FF90 BIT 7
1=COCO1
0=COCO3
BIT
6
1=MMU ACTIVE
BIT
5
1=CHIP IRQ ACTIVE
BIT
4
1=CHIP FIRQ ACTIVE
BIT
3
1=DRAM AT XFEXX IS CONSTANT
BIT
2
1= STANDARD SCS (DISK)
BIT
1
ROM
BIT
0
ROM
BIT
1
BIT 0 ROM MAP (vectors excluded)
0
x 16K INTERNAL, 16K EXTERNAL
1
0 32K INTERNAL
1
1 32K EXTERNAL
FF91 BIT 5
1=FAST
TIMER
BIT
0
MMU TASK SELECT 0=FFA0-FFA7 1=FFA8-FFAF
MMU Swaps $2000 blocks; block
# = address/$2000
FF98 BIT 7
0=TEXT,
1=BIT PLANE
BIT
6
NA
BIT
5
1=BURST PHASE INVERTED
BIT
4
1=MONOCHROME ON COMPOSITE MONITOR
BIT
3
1=50 Hz
BIT
2
LINE PER CHARACTER
BIT
1
" "
BIT
0
" "
BIT
1
BIT 2 BIT 3 LINES
0
0
0
ONE (GRAPHICS)
0
0
1
TWO (COCO1&2)
0
1
0
THREE "
0
1
1
EIGHT
1
0
0
NINE
1
0
1
RESERVED
1
1
0
TWELVE (COCO1&2)
1
1
1
RESERVED
FF99 BIT 7 NA
BIT
6
LINES PER FIEL
BIT
5
" "
BIT
4
HORIZONTAL RESOLUTION
BIT
3
" "
BIT
2
" "
BIT
1
COLOR RESOLUTION
BIT
0
" "
BIT
6
BIT 5 LINES
0
0 192
0
1 200
1
0 RESERVED
1
1 225
TEXT
BIT
4 BIT 3 BIT 2 BIT
1 BIT 0
32
0
-
0
-
1
40
0
-
1
-
1
80
1
-
1
-
1
GRAPH COLORS
640 4
1
1
1
0
1
640 2
1
0
1
0
0
512 4
1
1
0
0
1
512 2
1
0
0
0
0
320 16
1
1
1
1 0
320 4
1
0
1
0
1
256 16
1
1
0
1 0
256 4
1
0
0
0
1
256 2
0
1
0
0
0
160 16
1
0
1
1 0
FF9A BORDER REGISTER
BIT
7
-
BIT
6
-
BIT
5
MSB RED
BIT
4
MSB GREEN
BIT
3
MSB BLUE
BIT
2
LSB RED
BIT
1
LSB GREEN
BIT
0
LSB BLUE
FF9B RESERVED
FF9C VERTICAL SCROLL
BIT 7
- 4 NA
BIT
3
MSB
BIT 2
BIT 1
BIT
0
LSB
FF9D VERTICAL
OFFSET
V SCROLL MUST BE $0F
BIT
7
MSB
|
BIT 0
FF9E V OFFSET
#2
WORD = ADDRESS/8 EX. $E000 = $60000/8
BIT
7
WHY
8? BECAUSE 4 BITS(=8) FOR SCROLL
|
BIT
0
LSB
FF9F HORIZONTAL OFFSET
BIT
7
1=ENABLE VIRTUAL WIDTH, ALWAYS 128 TEXT - 256 BYTE GRAPH
BIT
6
MSB
|
BIT
0
LSB
FFB0 - FFBF PALETTES (see BORDER above for format)
HiRes text always two bytes per character; even
byte
6 bit character,
odd byte attribute.
BIT 7 1=BLINK
BIT 6 1=UNDERLINE
BIT 5 MSB FOREGROUND PALETTE
NUMBER
BIT
4
"
"
"
BIT 3 LSB
"
" "
BIT 2 MSB BACKGROUND
"
"
BIT
1
"
"
"
BIT 0 LSB
"
" "