Commodore Plus 4 - Page 439

Appendix O 487
Memory Range
Hexadecimal
Decimal
Usage
$8000-$FCFF
$8000-$CDFF
$CE00-$CFFF
$D000-$D7FF
$D800-$FBFF
$FC00-$FCFF
$FD00-$FD0F
$FD1O-$FD1F
$FD20-$FDCF
$FDD0-$FDDF
$FDE0-$FEFF
$FF00-$FF3F
$FF40-$FFFF
$FF40-$FFFF
32768-64767 RAM used by BASIC (under ROM)
32768-52735 BASIC and monitor ROM
52735-53247 Operating system ROM
53248-55295 Character ROM
55296-64511 Operating system ROM
64512-64767 Banking routines ROM (in all ROM
maps)
64768-64783 ACIA cjrip (used for RS232, in all maps)
64784-64799 Parallel port (6529, in all maps)
64800-64975 Unknown (in all maps)
64976-64991 Cartridge banking port (in all maps)
64992-65279 Direct Memory Access disk (in all maps)
65280-65343 Graphics chip (in all maps)
65344-65535 RAM (under ROM)
65344-65535 Operating system ROM
Detailed Memory Map of the Plus/4
Memory Location(S)
Hexadecimal
Decimal
$0000
$0001
$0002
$0003-$0006
$0007
$0008
$0009
$000A
$000B
$000C
$000D
$000E
$000F
0
1
2
3-6
7
8
9
10
11
12
13
14
15
Usage
Processor on-chip data direction register
Processor on-chip data register
BASIC token to search for in BASIC stack
Storage for RENUMBER
Start character to search for in BASIC text
End character to search for in BASIC text
Save last TAB column
Flag for load ($00) or verify ($01)
Buffer pointer for input/number of
subscripts
Flag for default array dimension
Flag for data type ($00=numeric,
$FF=string)
Flag for data type ($00=floating,
$80=integer)
Flag for garbage collect/ DATA scan/
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