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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
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