3350 Reference Information

         DC    X'1F',AL3(FILEMASK),X'40',x'00',AL2(1)         --- Set File Mask CCW
             :
             :
FIELMASK DC  X'file-mask-bits'

File Mask
00......  - Do not allow Write Home Address and Write Record Zero
01......  - Do not allow any write commands
10......  - Do not allow Write Format commands
11......  - Allow all write commands
...00...  - Allow all Seek commands
...01...  - Allow Seek Cylinder and Seek Head commands 
...10...  - Allow Seek Head commands
...11...  - Do not allow Seek commands or head switching
......0.  - Do not allow Diagnostic Write commands
......1.  - Allow Diagnostic Write commands
.......0  - Not PCI Fetch mode
.......1  - PCI Fetch mode
..0..0..  - Must always be Zero

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