No error, invalid command. invalid sector address, invalid
LUN,
drive
not ready, write fault,
DMA
error.
Set
Drive Parameters
Action
(Class
0,
Opcode
C)
This command points to a
6
byte block of memory. specified by bytes
6
and
7
of the command block, that sets the following parameters
for both of the hard disk drives (logical units
0
and
1):
Table
5-9.
Set Drive Parameters
If
the above command is not executed after power up or every reset,
the
HDC
will assume the following default parameters:
D7
I
D6
1
D5
1
D4
User Options
0
1
Num. of Heads
Number of cylinders
(131
hex)
Number of heads
Starting write precompensation cylinder
Reduce write current cylinder
Step rate
Maximum length of an error bust to be corrected
Number of sectors per track
Retries
&
ECC
enable
D3
D2
I
D1
I
DO
Step Rate
CYL. Nums. MSN
The acceptable range of values for these parameters are as follows:
Number of Cylinders LSB
Precompensation Cylinder
1
16
Reduce Write Current Cylinder
/
16
Number of Sector per Track
0
-
2047. Number of cylinders
0-7
Number of heads
0
-
255 Sector Numbers
0
-
1023. Starting write precompensation cylinder
51 11. Maximum length of error burst to be corrected
018 Retries
If one of the parameters is out of range, then an "invalid command"
error code is generated by the
HDC.
Bytes
2
and
5
of table are self
explanatory and will not be discussed any further.
User Options
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