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Color Computer 2 Memory Map: Difference between revisions

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==Overview==


{| class="wikitable"
{| class="wikitable"
!Start address  
!Start address  
! End address  
! End address  
! Contents
! Size (KB)
!Contents
|-
|-
|0000
|0000
|03FF
|03FF
|System Use
| 1
|[[#System Use|System Use]]
|-
|-
|0400
|0400
|05FF
|05FF
|Text screen memory  
| 0.5
|Text screen memory
|-
|-
|0600
|0600
|0BFF
|0DFF
|Graphics page 1
| 2
|Disk System RAM 
|-
|-
|0C00
|0E00
|11FF
|7FFF
|Graphics page 2
| 30.5
|Free RAM (depending on use of graphics pages)
|-
|-
|1200
|0E00
|17FF
|25FF
|Graphics page 3
| 4.5
|Hires graphics page 1 (disk systems)
|-
|-
|1800
|2600
|1DFF
|3DFF
|Graphics page 4
| 4.5
|Hires graphics page 2 (disk systems)
|-
|-
|1E00
|8000
|23FF
|9FFF
|Graphics page 5
|8
|Extended BASIC ROM 
|-
|-
|2400
|A000
|29FF
|BFFF
|Graphics page 6
|8
|COLOR BASIC ROM
|-
|-
|2A00
|C000
|2FFF
|DFFF
|Graphics page 7
|8
|Cartridge ROM 
|-
|-
|3000
|C000
|D800
|6
|Disk BASIC ROM
|-
|E000
|FEFF
|7.75
|Unused
|-
|FF00
|FFFF
|0.25
|[[#Input/Output Area|Input/Output Area]]
|}
 
Graphics page areas on cassette based systems:
 
{| class="wikitable"
!Start address
! End address
! Size (KB)
!Contents
|-
|0600
|1DFF
| 4.5
|Hires graphics page 1 (cassette systems)
|-
|1E00
|35FF
|35FF
|Graphics page 8
| 4.5
|-
|Hires graphics page 2 (cassette systems)
more...  
|}
 
== System Use ==
 
coming soon...  
 
== Input/Output Area ==
 
{| class="wikitable"
! 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
|}
|}
[[Category:Programming]]

Latest revision as of 23:01, 3 October 2021

Overview

Start address End address Size (KB) Contents
0000 03FF 1 System Use
0400 05FF 0.5 Text screen memory
0600 0DFF 2 Disk System RAM
0E00 7FFF 30.5 Free RAM (depending on use of graphics pages)
0E00 25FF 4.5 Hires graphics page 1 (disk systems)
2600 3DFF 4.5 Hires graphics page 2 (disk systems)
8000 9FFF 8 Extended BASIC ROM
A000 BFFF 8 COLOR BASIC ROM
C000 DFFF 8 Cartridge ROM
C000 D800 6 Disk BASIC ROM
E000 FEFF 7.75 Unused
FF00 FFFF 0.25 Input/Output Area

Graphics page areas on cassette based systems:

Start address End address Size (KB) Contents
0600 1DFF 4.5 Hires graphics page 1 (cassette systems)
1E00 35FF 4.5 Hires graphics page 2 (cassette systems)

System Use

coming soon...

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
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