MediaWiki:Sitenotice:
2025-12-29: I have restored the wiki to a backup from the end of November. Starting in September 2025, accesses went form the 800MB-1.2GB range per month to 26GB in September, 42GB in October, and 70GB in November with most accesses originating from China. As soon as I realized what was causing all the access problems in November, I shut it down (it had reached 36GB by then) behind a password/login screen. The database had gotten corrupted, and I tried a restore from just before the spike in access but that didn't work. Thus, end of November. I still have the other daily backups so if there were any important additions in December, let me know and maybe they can be recovered. - Allen H.
Color Computer 2 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 |