From CoCopedia - The Tandy/Radio Shack Color Computer Wiki
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Overview
| Start address
|
End address
|
Size (KB)
|
Contents
|
| 0000
|
03FF
|
1
|
System Use
|
| 0400
|
05FF
|
0.5
|
Text screen memory
|
| 0600
|
7FFF
|
30.5
|
Free RAM (depending on use for display or DECB)
|
| 0600
|
1DFF
|
4.5
|
Full graphic 6 / pmode 3 & 4 page 1
|
| 0600
|
18CE
|
4
|
DECB Use (CONFLICT WITH GRAPHICS PAGE 1)
|
| 1E00
|
35FF
|
4.5
|
Full graphic 6 / pmode 3 & 4 page 2
|
| 8000
|
9FFF
|
8
|
Extended BASIC ROM
|
| A000
|
BFFF
|
8
|
COLOR BASIC ROM
|
| C000
|
DFFF
|
16
|
Cartridge ROM
|
| C000
|
D800
|
6
|
Disk BASIC ROM
|
| E000
|
FEFF
|
7.75
|
Unused
|
| FF00
|
FFFF
|
0.25
|
Input/Output Area
|
Input/Output Area
| Start address
|
End address
|
Contents / Function
|
| FF00
|
FF1F
|
Peripheral Interface Adapter (PIA) 0
|
| FF00
|
|
PIA0 data port A: Keyboard rows & joystick button
|
| FF01
|
|
PIA0 control port A: Horizontal sync & interrupt control
|
| FF02
|
|
PIA0 data port B: Keyboard columns
|
| FF03
|
|
PIA0 control port B: Vertical sync control
|
| FF04
|
FF1F
|
PIA0 mirrors
|
| FF20
|
FF3F
|
Peripheral Interface Adapter (PIA) 1
|
| FF20
|
|
PIA1 data port A: sound/cassette/RS-232 output/input
|
| FF21
|
|
PIA1 control port A: Cassette motor control
|
| FF22
|
|
PIA1 data port B: VDG control
|
| FF23
|
|
PIA1 control port B: FIRQ & sound control
|
| FF24
|
FF3F
|
PIA1 mirrors
|
| FF40
|
FF5F
|
Diskette I/O usage
|
| FF60
|
FF7F
|
Miscellaneous external hardware control
|
| FF80
|
FFBF
|
Unused in CoCo 1 & 2
|
| FFC0
|
FFDF
|
SAM registers (screen mode & offset)
|
| FFE0
|
FFF1
|
Reserved
|
| FFF2
|
FFFF
|
Interrupt vectors
|