IBM System/360

2841 STORAGE CONTROL
Command
Hex Code
Command Name
Single
Multi-
Type
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
lF
--
Space Count OF
--
Restore (2321 only) 17
--
Sense Test I/O
00
--
Sense I/O 04
--
Read Read Data 06 86
Read Key-Data
OE BE
Read-Count-Key-Data lE
9E
Read Home Address lA 9A
Read RO 16 96
Read Connt 12 92
Read IPL
02
--
Write
Write Data 05
--
Write Key-Data
OD
--
Write-Count-Key-Data lD
--
Write Home Address 19
--
Write RO
15
--
** Write (Special) ColUlt-Key-Data
01
--
Erase
11
--
Search
Search Equal ID
31
Bl
Search High ID 51
D1
Search Equal-Hi-ID 71
Fl
Search Equal Key
29
A9
Search High Key 49
C9
Search Equal-Hi Key 69
E9
Search Equal HA 39
B9
*** Search Equal Key Data
2D
AD
*** Search High Key Data
4D
CD
*** Search Hi-Eq Key Data
SD ED
**** Continue Scan Equal
25
AS
**** Continue Scan High
45
C5
**** Continue Scan Hi Eq
65
E5
**** Continue Scan, No Compare
55
D5
**** Continue Scan, Set Compare
75, 35
F5,B5
Switching * Reserve Device
B4
--
* Release Device
94
--
* Special feature used with Two-Channel Switch.
Special feature used with Record Overflow.
*** Special feature used with File Scan.
Used with File Scan with Record Overflow.
92 S/360
IBM CONFIDENTIAL