Commodore Plus 4 - Page 436

484 Appendix G
Hexadecimal Decimal Bits
Function
$FF08
SFF09
$FFOA
$FFOB
$FFOC
SFFOD
$FFOE
$FFOF
$FF1O
$FF11
$FF12
$FF13
$FF14
65288 0-7 Latch register for keyboard
65289 0 Not connected
1 Raster interrupt flag
2 Light pen interrupt flag
3
Timer 1 interrupt flag
4 Timer 2 interrupt flag
5 Not connected
6 Timer 3 interrupt flag
7 Interrupt occurred flag
65290 0 High bit for raster interrupt value
1 Raster interrupt enable
2 Light pen interrupt enable
3 Timer 1 interrupt enable
4 Timer 2 interrupt enable
5 Not connected
6 Timer 3 interrupt enable
7 Not connected
65291 0-7 Low byte for raster interrupt value
65292 0-1 High bits for hardware cursor position
2-7 Not connected
65293 0-7 Low byte for hardware cursor position
65294 0-7 Low byte of frequency for voice 1
65295 0-7 Low byte of frequency for voice 2
65296 0-1 High bits of frequency for voice 2
2-7 Not connected
65297 0-3 Volume: 0 = off, F = highest
4 Select voice 1
5 Select tone generator for voice 2
6 Select noise generator for voice 2
7 Sound reload switch: 0 = on , 1 = off
65298 0-1 High bits of frequency for voice 1
2 0 = get data from RAM, 1 = get data
from ROM
3-5 Base address for bit map
6-7 Not connected
65299 0 Status of clock
1 Single clock set
2-7 Base address for character data
65300 0-2 Not connected
3-7 Base address for color and screen
memory