MediaWiki:Sitenotice:
2024-03-02: The wiki ran out of disk space, so things were not working. This has been resolved by adding another 5GB of quota ;-) Thanks to Tim Lindner for reporting the issues.
2020-05-17: If a page gives you an error about some revision not being found, just EDIT the page and the old page should appear in the editor. If it does, just SAVE that and the page should be restored. OS-9 Al (talk) 12:22, 17 May 2020 (CDT)
Color Computer 2 Memory Map
(Redirected from Color Computer Memory Map)
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 |