IBM System/370 145 Reference Summary page 75

Commands
Hex Code
Command
Single Multi-
Type Command Name Track
Track
Control Seek (BB CC HH)
07
-
Seek Cylinder (CC HH)
OB
-
Seek Head (HH)
1B -
Recalibrate
13 -
No Operation 03 -
Set File Mask
1F -
Space Count OF -
Restore (2321 only) 17
-
Sense
Test 1/0 00 -
Sense 1/0 04 -
Read Read Data
06 86
Read Key-Data
OE 8E
Read-Count-Key-Data
1E 9E
Read Home Address 1A 9A
Read RO 16 96
Read Count 12 92
Read IPL
02
-
Write Write Data
05 -
Write Key-Data OD -
Write-Count-Key-Data 1D -
Write Home Address 19 -
Write RO 15 -
Write (Special) 01 -
Count-Key-Data
Erase
11 -
Search
Search Equal ID 31 B1
Search High ID 51 D1
Search Equal-Hi-ID 71 F1
Search Equal Key 29 A9
Search High Key
49 C9
Search Equal-Hi Key 69 E9
i
Search Equal HA 39 B9
Search Equal Key Data
2D AD
Search High Key Data
4D CD
Search Hi-Eq Key Data 6D ED
Continue Scan Equal 25
A5
Continue Scan High 45
C5
Continue Scan Hi Eq 65 E5
Continue Scan, 55 D5
No Compare
Continue Scan, 75,35
F5,B5
Set Compare
Seek Address
Cell Number Cylinder Number Head Number
Type ByteO Byte1 Byte2 Byte 3 Byte 4 Byte 5
2314 0 0 0 0-202 0 0-19
File Protection
The significance of the file mask bits is:
BO B1
0 0
0 1
1 0
B3 B4
0 0
0 1
1 0
1 1
Inhibit Write Home Address and Write RO
Inhibit all write commands
Inhibit Write Home Address - Inhibit Write RO -
Inhibit Write Count, Key, and Data
Permit all write commands
Permit all seek and restore commands
Permit Seek CCHH and HH CCWs
Permit Seek HH CCW
Inhibit all seek commands
B2 B5 B6 B7
0 0 0 0
Status Byte
Bit Name Note
0
Attention Not Used
1 Status Modifier Used with Search and Control
Unit Busy.
2
Control Unit The control unit has finished
End an operation.
3 Busy Indicates addressed access
mechanism is moving; or used in
conjunction with Status Modifier
to indicate Control Unit Busy.
4 Channel End The control unit has received all
the data from the channel needed
to do the operation called for
and the channel is freed.
5
Device End Indicates that an access mechanism
is free to be used.
6 Unit Check Indicates that a control unit or
programming error or device
hardware check has been
detected.
7
Unit Exception End-of-File.
CONTROL WORDS FORCED FOR IFA
SHARE CYCLE
Output
Input
Skip
MS
60680C08
68880C08
68840E08
cs
60884008
68884008
68844208
NOTE: These control words are hardware
forced into the C-reg.
IFACLOCK
~---400nsec--------
300
Bot Ring Adv
(Only on Bit Ring 7)
5.4