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FileCore_MiscOp 1
Programmer's Reference Manuals
» Part 15 – SWI Calls
» FileCore
» FileCore_MiscOp
» FileCore_MiscOp 1
FileCore_MiscOp 1
(SWI &40549)
| Entry | |
|---|---|
| R0 | 1 |
| R1 | Drive number |
| R2 | Sequence number |
| R8 | Pointer to Filecore instance private word |
| Exit | |
|---|---|
| R0 | Preserved ? |
| R1 | Preserved ? |
| R2 | Sequence number |
| R3 | Result flag |
| R8 | Preserved ? |
Use
The purpose of this call is to return information on the drive to see if a change has occurred.
Notes
The sequence number is to ensure no changes are lost due to reset being pressed. Both the given filing system and the FileCore incarnation should start with a sequence number of 0 for each drive. The filing system increments the sequence number with each change of state. If the filing system finds the entry sequence number doesn’t match its copy it should return changed/maybe changed, depending on whether the disc changed line works/doesn’t work.