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Page of GA26-1638-I
Revised Jan. 31, 1978
By
TNL: GN26-0342
SENSE BYTE 6
This byte identifies the logical track address and cylinder used in the current Seek.
high-order address bit; bits 3 through 7 indicate the logical track.
Bit No.
3350 Native or 3330-11 Compatibility Mode
0
CE Cylinder*
1
Cylinder 512
2
Cylinder 256
3
Logical Head 16
4
Logical Head 8
5
Logical Head 4
6
Logical Head 2
7
Logical Head 1
Bits 0 through 2 indicate the
3330-1 Compatibility Mode
CE Cylinder*
Cylinder 256
Cylinder 0
*When CE cylinder 1024 is addressed, bit 0= 1 and all other cylinder bits of bytes 5 and 6
=
0. Bits 3 through 7 of byte 6
can address any valid head.
SENSE BYTE 7
Bits 0-3
Specifies format of sense bytes 8 through 23 as follows:
Format
Type
0000
(Format 0)
Programming
I
system checks.
0001
(Format 1)
Device checks.
0010
(Format 2)
Storage control equipment checks.
0011
(Format 3)
Storage control checks.
0100
(Format 4)
ECC uncorrectable data checks.
0101
(Format 5)
ECC correctable data checks*.
0110
(Format 6)
Usage
I
error statistics.
* Also may be presented on errors which are not ECC correctable but which require restart
displacement information.
Bits 4-7
Message code indicating type of error; defined on Format Message page. (See Figure 22.)
Message·
Code
Figure 21. 3350 Sense Bytes 6 and 7 Descriptions
36 IBM 3350 Reference Manual
1
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