Commodore 128 Programmer's Reference Manual page 540

530 COMMODORE 128
C128 Memory Map
MEMORY
ADDRESS
LABEL
SIDREG24
SIDREG25
SIDREG26
SIDREG27
SIDREG28
(continued)
HEXADECIMAL
ADDRESS
DECIMAL
ADDRESS
\
DESCRIPTION
SID REGISTERS
D418
D419
D41A
D41B
D41C
54296
54297
54298
54299
54300
MODE/VOLUME
7
6
5
4
3-0
CUTOFF VOICE 3 OUTPUT
(1 = OFF)
SELECT HI-PASS FILTER
(1 = ON)
SELECT BAND-PASS FILTER
(1 = ON)
SELECT LO-PASS FILTER
(1 = ON)
OUTPUT VOLUME (0-15)
POT X, A/D CONVERTER, PADDLE 1
POT Y, A/D CONVERTER, PADDLE 2
OSCILLATOR 3, RANDOM NUMBER
GENERATOR
ENVELOPE GENERATOR 3 OUTPUT
C128 MEMORY MANAGEMENT UNIT, PRIMARY REGISTERS
MMUCR1
PCRA
PCRB
PCRC
PCRD
MMUMCR
IMPLEMENTS C128, C64, &
D500
D501
D502
D503
D504
D505
54528
54529
54530
54531
54532
54533
CP/M 3.0 MODES
CONFIGURATION REGISTER
PRECONFIGURATION REGISTER A
PRECONFIGURATION REGISTER B
PRECONFIGURATION REGISTER C
PRECONFIGURATION REGISTER D
BITS ($D500-$D504)
7-6
5-4
3-2
1
0
RAM BANK (0-3)
ROM HI (SYSTEM, INT,
EXT, RAM)
ROM MID (SYSTEM, INT,
EXT, RAM)
ROM LO (SYSTEM, RAM)
I/O (I/O BLOCK,
ELSE ROM-HI)
MODE CONFIGURATION REGISTER
7
6
5
4
3
2-1
0
40/80 KEY SENSE
OS MODE, 0 = C128/l = C64
/EXROM LINE SENSE
/GAME LINE SENSE
FSDIR
NOT USED
PROCESSOR, 0=Z80/l = 8502
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