CD_Inquiry (changes)
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CDFSDriver
» SWI Calls
» CD_Inquiry
CD_Inquiry
(SWI &41255)
| Entry | |
|---|---|
| R0 | Pointer to 36 byte block |
| R7 | Pointer to |
| Exit | |
|---|---|
| R0 | Buffer updated |
36 Byte Block
| Offset | Contents |
|---|---|
| 0 | Device Type |
| 4 | Length of block – 4 |
| 5 – 6 | Reserved |
| 7 | Interface Flags |
| 8 | Vendor identification, space padded to 8 characters |
| 16 | Product identification, space padded to 16 characters |
| 32 | Product revision level, space padded to 4 characters |
Device Type
| Bit | Meaning |
|---|---|
| 0 – 4 Device Type | |
| 0 | Direct access device |
| 5 | CD-ROM device |
| 7 | Optical memory device |
| 8 | Medium changer device |
| 5-7 Device qualifier | |
| 0 | Device is connected |
| 1 | Device is not connected |
| 3 | Target doesn’t support any device |
| 15 | Device is removable |
| 16 – 18 | ANSI-approved version supported |
| 19 – 21 | ECMA version supported |
| 22 – 23 | ISO version supported |
| 24 – 27 Response format | |
| 0 | Follows SCSI I format |
| 1 | Compatible with pre-SCSI I devices |
| 2 | Follows SCSI II format |
| 28 – 29 | Reserved |
| 30 | Device supports Terminate I/O Process message |
| 31 | Device supports asynchronous event notification |
Interface Flags
| Bit | Meaning |
|---|---|
| 0 | Device responds to the reset condition with soft reset |
| 1 | Supports tagged command queuing |
| 2 | Reserved |
| 3 | Supports linked commands |
| 4 | Supports synchronous data transfer |
| 5 | Supports 16 bit data transfers |
| 6 | Supports 32 bit data transfers |
| 7 | Supports relative addressing mode |
Use
The purpose of this call is to return the CD-ROM device information.
Notes
Do not rely too much on some of the SCSI specific values making sense. sense, as not all drives are trueSCSI devices.
See also
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