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=>     R0 =     reason code
     R1 =     pointer to filename
     others dependant on call

This entry point is called for operations on the filing system in general.
FSEntry_Func reason codes
Reason     Meaning

0     Set current directory (RO2)
1     Set library directory (RO2)
2     Catalogue directory (*Cat)
3     Examine directory (*Ex)
4     Catalogue library (*LCat)
5     Examine library (*LEx)
6     Examine objects (*Info)
7     Set FS Options (*Opt)
8     Rename object
9     Access objects
10     Boot from filing system
11     Read name and boot option
12     Read CSD and privilege byte
13     Read library and privilege byte
14     Read directory entries
15     Read directory entries and info
16     Shutdown filing system
17     Print startup banner
18     Set directory contexts (never called)
19     Read directory entries and information
20     Output full information on objects
23     Canonicalise special field and disc name
24     Resolve wildcard
25     Read defect list
26     Add a defect
27     Read boot option
28     Write boot option
29     Read used space map
30     Read free space
31     Name image
32     Stamp image
33     Get usage of offset
34     Notification of changed directory
35     Read free space 64
36     Read defect list 64
37     Add a defect 64

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