HuC6820
The HuC6280 processor provides a 21bit address bus on the TurboGrafx allowing contiguous addressing of up to 2MB. The address space is divided into 256 8KB pages.
| Start Address | End Address | Pages | Size* | Description |
|---|---|---|---|---|
| 0x000000 | 0x0FFFFF | 0x00 - 0x7F | 1MB | HuCard ROM Space (may be mirrored with HuCards smaller than 1MB) |
| 0x100000 | 0x1EEFFF | 0x80 - 0xF7 | Unused, see CD-ROM | |
| 0x1F0000 | 0x1F7FFF | 0xF8 - 0xFB | 8KB | RAM - pages 0xF9 - 0xFB are mirrors of 0xF8 |
| 0x1F8000 | 0x1FDFFF | 0xFC - 0xFE | Unused | |
| 0x1FE000 | 0x1FFFFF | 0xFF | 8KB | Hardware Page |
*size refers to the useful size within the range excluding any mirroring
Super System Card
| Start Address | End Address | Pages | Size * | Description |
|---|---|---|---|---|
| 0x000000 | 0x0CFFFF | 0x00 - 0x67 | 832KB | ROM Space |
| 0x0D0000 | 0x0FFFFF | 0x68 - 0x7F | 192KB | RAM |