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FDD412A/B
Table
2.7
Contents
of IBM Data
Format
Length
(Byte)
eal Ip
LCzLO___HDO
1
(FC)
Specia
Other
tracks
4
(C2) (C2) (C2) (FC)
62
CYLO
HDO
1
2
(FF)
x
26B
+
(00)
x
6B
(AE) x 50B
+:°(00)
x
12B
(FE)
Missing
clock
(Al) (Al) (A1) (FE)
Missing
clock
(00)
% (4C);
Track
number
(00)
or
(01);
Head
number
(01)
(1A);
Record
(secotr
(00)=128B
(01)=256B;
data
part
length'
Check
byte
(FF)
x
11B
+
(00)
X
6B
|) Other
tracks
CYLO
HDO
|
1
Other
tracks
TRACK
All
tracks
HEAD
All
tracks
|
tracks
tracks
tracks
CYLO
HDO
Other tracks
256
All tracks
(FF) x 27B + (00) x 6B
| TYP247 |
FM
method
MFM
method
TYP247 | (FF) _x 2478
(FF)
598B
Other
tracks
2.5
Logic
Operations
2.5.1
Sensor-Related
Operations
Table
2.8
Names
and
Functions
of Sensors
Detection
:
Relation
to
Sensor
Name
Function
:
System
Interface
Signal
Photo-
t
iti
1
TRACK
00
fe) ce
Detec
s head
position
TRACK
OO-N
transistor
status.
:
oh
;
Photo-
Detects
a write-
transistor
pas!
Photo-
inhibited
disk.
Detects
the
single-
'Checks
if
the
door
is
closed.
transistor
Microswitch
DOOR
SWITCH
~15—
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