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A
If busy (bit 6 on), Search Sector is in progress.
If set read /write is on (byte 19, bit 0 = 1), byte 8 is read as follows:
0
1
2
3
4
5
6
Controller
Write Current
Drive Check
Read/Write
On Line
Padin
Index Mark
Checks
Sense
Check
Progress
B
With message code A or B (byte 18, bits
4
through 7), bytes 13 and
14
indicate:
0
2
3
4
5
6
Previous Seek Address (access position before present seek, bytes 5 and 6) Low Physical Cylinder.
128
64
High Physical Cylinder Ad-
dr
SS
512
256
32
16
32
16
8
4
2
Physical Head Address
8
4
2
7
3330
Modes
7
C
If equipment check is on (byte 0, bit 3) and with message code A indicated in byte 7, bits 4 through 7, bytes 20 and 21
indicate:
0
128
64
High Physical Cylinder Ad-
dr
SS
512
256
2
3
4
5
6
7
Present Seek Address (low physical cylinder address)
32
16
I
8
4
2
Physical Head Address
32
16
8
4
2
D
Microprogram error messages (sense byte 18, bits 4 through 7)
0
Unused
8
Repetitive command overruns on G 1 operations.
1
No tag valid on read/write operation.
9
Repetitive command overruns.
2
No normal or check end on read/write or ECC
A
Incorrect drive selected.
operations.
3
No response from drive on control operation.
B
Busy missing after seek start was issued.
4
Time out waiting for index.
c
Unused
5
ECC hardware check.
D
Unused
6
Multiple or no controller selected.
E
Always active bit on bus in.
7
Preselection check.
F
Unresetable interrupt.
Sense Data
39
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