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
CCW Command Normal Multi-Track
Search ID Equal 31 B1
Search ID High 51 D1
Search ID Eq/High 71 F1
Search Key Equal 29 A9
Search KEY High 49 C9
Search KEY Eq/High 69 E9
Read Count 12 91
Read R0 16 96
Read Data 06 86
Read Key & Data 0E 8E
Read CKD 1E 9E
Read Multiple CKD 5E
Write CKD 1D -
Write Data 05 -
Write Key & Data 0D -
Erase 11 -
Set File Mask 1F -
Track Size After Formatting = 19,254
Block Overhead w/No Key = 185 (includes count area)
Block Overhead w/Key = 267 (includes count area)