Commodore Plus 4 - Page 437

Appendix 6 425
Hexadecimal Decimal
Bits Function
$FF15
SFF16
$FF17
$FF18
$FF19
$FF1A
$FF1B
$FF1C
$FF1D
$FF1E
SFF1F
65301
65302
65303
65304
65305
65306
65307
65308
65309
65310
65311
0-3
4-6
7
0-3
4-6
7
0-3
4-6
7
0-3
4-6
7
0-3
4-6
7
0-1
2-7
0-7
0
1-7
0-7
0-7
0-2
3-6
7
Background color
Background luminance
Not connected
Color for color 1
Luminance for color 1
Not connected
Color for color 2
Luminance for color 2
Not connected
Color for color 3
Luminance for color 3
Not connected
Border color
Border luminance
Not connected
High bits for bit map reload
Not connected
Low byte for bit map reload
High bit of current vertical raster
position
Not connected
Low byte of current vertical raster
position
Current horizontal raster position
Vertical sub address
Blink address
Not connected
Memory Usage on the Plus/4
Memory Range
Hexadecimal
Decimal
Usage
$0000-50001
$0002-$00CF
$00D0-$00D7
$00D8-$00E8
$00E9-$00FF
$0100-$0122
S0123-S01FF
0-1
2-207
208-215
216-232
233-255
256-290
291-511
Processor on-chip data registers
System zero page storage
Zero page area reserved for speech software
Free zero page area for applications
System zero page storage
System storage
Processor stack