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6.4
FORMAT UNIT (04H)
BIT
BYTE
-------------------------------------------------------
01.
Logical Unit Number! Data! Cmplt!
List Format Bits
02
03
04
05
(MSB)
Data Pattern
Interleave
Interleave
(LSB)
Reserved
(0)
I
Flag
I
Link
Figure 6-5.
FORMAT UNIT Command
The ACB-5500
will write from index to index all
10
and DATA
fields with the format specified by an immediately previous MODE
SELECT (15
H )
command.
If no MODE SELECT command has been exe-
cuted, the'previous format will be used. On unformatted disks or
those whose format cannot be determined (sense byte error code
IC
a
returned following a READ), a MODE SELECT command is required
prlor to the format command. Data fields are completely written
with 6C H unless otherwise specified in the format command.
The ACB-5500 formats out all indicated disk defects during disk
formatting.
Byte
01 is used to indicate if a list of
defect locations is
appended and whether unique fill characters are to be used.
500504-00
6-10
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