Table of Contents
Advertisement
3350 SENSE BYTES
Bit
0
Bit 1
Correctable
Bit
2
Bit
3
Environmental Data
Present
Bit 4
Bits
5-7
Bits
0-7
Restart
Command
Bits
0-7
Physical
Drive
Identification
Bits
0-7
Low Order Logical
Cylinder Address
SENSE BYTE 2
Unused -- set to
0.
Indicates that data error posted in byte
0,
bit 4 is correctable. Bytes
15
through
22
identify error
pattern and restart displacement.
Alternate controller selected.
Indicates that bytes
8
through
23
contain either usage, error statistics, or error log information.
If 1, drive is operating in a
3330
compatibility mode. If
0,
drive is operating in native mode.
Unused -- set to
0.
SENSE BYTE 3
When byte 1, bit 7 is set, this byte shows the operation in process at the time of interrupt:
0000 0110
= Read
0000 0101
= Write
(Zero when byte 1, bit 7 is off.)
SENSE BYTE 4
This byte identifies the physical drive selected.
Bit 0 = drive 0, bit 1
=
drive 1, and so on. The bit number is equal to the drive number.
SENSE BYTE 5
Identifies low-order eight bits of the current seek argument.
Bit
0
1
2
3
4
5
6
7
Cylinder
128
64
32
16
8
4
2
1
Figure 20. Sense Bytes 2 through S Descriptions
Sense Data
35
Advertisement
Table of Contents
