OtherCommands
From Yabause
Contents
Authenticate Device(0xE0)
Format:
| CR1 | 0xE000 |
| CR2 | Authentication type(word) - Use either 0x0000 for CD, 0x0001 for MPEG card. |
| CR3 | ???(high byte) |
| CR4 | 0x0000 |
Returns: CD status data
| HIRQ | MPED(if authenticating MPEG card), EFLS and CSCT(if authenticating CD) |
Notes: Goes to busy status until operation completes. I'm not sure what goes in CR3, but 0x0000 should be fine.
Get Device Authentication Status(0xE1)
Format:
| CR1 | 0xE100 |
| CR2 | Authentication type(word) - use either 0x0000 for CD, 0x0001 for MPEG card |
| CR3 | 0x0000 |
| CR4 | 0x0000 |
Returns:
| CR1 | CD Status(high byte) |
| CR2 | Authentication status(see notes) |
| CR3 | 0x0000 |
| CR4 | ???(word) |
| HIRQ | N/A |
Notes: Returns the status of the authenticate device command. For CD type, it'll return:
| 0x0000 | No CD/Not Authenticated |
| 0x0001 | Audio CD |
| 0x0002 | Regular Data CD(not a Saturn disc!) |
| 0x0003 | Non-original Saturn disc |
| 0x0004 | Original Saturn disc |
MPEG card type returns:
| 0x0000 | No MPEG card/Not Authenticated |
| 0x0002 | MPEG card Present |
Get MPEG Card Boot ROM(0xE2)
Format:
| CR1 | 0xE200 |
| CR2 | Sector read offset(word) |
| CR3 | Filter/buffer number?(high byte) |
| CR4 | Number of sectors(word) |
Returns: CD status data
| HIRQ | MPED |
Notes: Copies the specified part of the MPEG ROM into the CD buffer, which you can then retrieve using the Get/Get Then Delete Sector commands, etc.
