=> R0 = 1 (reason code)
R1 = drive
R2 = sequence number
R8 = pointer to FileCore private instance word
<= R2 = sequence number
R3 = result flag
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.
MiscOp 3 result flags
Bit Meaning when set
0 not changed
1 maybe changed
2 changed
3 empty
4 ready
5 drive is 40 track
6 empty works
7 changed works
8 disc in drive is high density
9 density sensing works
10 ready works
11-31 reserved must be zero
Exactly one of the bits 0-3 must be set. Once bit 6 or 7 is returned set for a given drive, they must always be so.
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