Commodore VIC-20 Programmer's Reference Manual page 193

1
1
I
!
1
1
HEX
911E
911F
9120-912F
9120
9121
9122
9123
9124
9125
9126
9127
9128
9129
912A
912B
912C
912D
912E
912F
9400-95FF
9600-97FF
9S0O-9BFF
9C00-9FFF
AOOO-BFFF
C0OO-DFFF
EOOO-FFFF
DECIMAL
37150
37151
37152-37167
37152
37153
37154
37155
37156
37157
37158
37159
37160
37161
37162
37163
37164
37165
37166
37167
37888-38399
38400-38911
38912-39935
39936-40959
40960-49152
49152-57343
57344-65535
DESCRIPTION
Interrupt enable register
Port A (Sense cassette switch)
6522 VIA#2
Port B output register
keyboard column scan
(PB3) Bit 3 ^cassette write line
(PB7) Bit 7 -Joy 3
Port A output register
keyboard row scan
Data direction register B
Data direction register A
Timer 1, low byte latch
Timer 1, high byte latch
Timer 1, low byte counter
Timer 1. high byte counter
timer 1 is used for the
60 time'second interrupt
Timer 2, low byte latch
Timer 2. high byte latch
Shift register
Auxiliary control register
Pertpriera! control register
CA1 Cassette read line (Bit 0)
CA2 Serial clock out (Bits 1-3)
CB1 Serial SRQ IN (Bit 4)
CB2 Serial data out (Bits 5-7)
Interrupt flag register
Interrupt enable register
Port A output register
location of COLOR RAM with
additional RAM at blk 1
Normal location of COLOR RAM
I.0 block 2
I.O btock 3
8K decoded block lor expansion ROM
8K Basic ROM
8K KERNAL ROM
177