Honeywell 6000 Series Reference Manual page 22

N
I
t-
O
t:1
t::C
w
-.J
SAME AS GAP 2
J-
REF: FIGURE 2·7
•
DEVICE
NUMBER
1 BYTE
SPLICE
AREA
•
41 BYTES
ZEROS
.... ADDRFSS "lARKS
CJ
BYTES WITIU
H IT
ANY
r--I STARTS All. RECORDS AFTER RO.
ADDRESS MARKS ARE USED TO FIN!> THE
START OF
A
RECORD WITHOUT WAITIN(;
JOR INDEX.
•
ADDRESS
MARK
3
BYTE GAP
•
12 BYTES
ZERO
I
PLO SYNC AREA rSAME AS GAP
2
.. LREF: FIGURE 2·7
, ~
________ .JA ,
SYNC
HEX 1')
II)
HEX19
,
,
GAP
3
GAP 2
59 BYTES
49 BYTES
ALL ZEROS FROM END
r------------II
OF LAST DATA FIELD
TO INDEX
GAP
4
INDEX
POINT
R 1 FIELD (AND ALL OTHERS FOLLOWING)
1. NORMAL CUSTOMER DATA FIELD
Rl COUNT
·11 + 7
HCC
B'iTES
Rl DATA
288+7 ECC
BYTES
GAP 3 LAST
RECORD
DATA
2. COUNT FIELD DEFINES LENGTH OF DATA FIELD.
TRACK ADDRESS AND SECTOR NUMBER.
,
~
-
3.
'DATA FIELD CO~TAINS THE CUSTOMER DATE.
4. DATA FIELDS
CA~
BE REWRITIEN WITHOVT
CHA~Gl~G BAL.-\~CE
OF THE TRACK.
----------1' . ,
PHYSICAL
ADDRESS
FLAG CYLINDER CYLINDER HEAD HEAD RECORD KEY LENGTH
DATA
LE:\GTH
D.-\TA
LE:\GTH
7 ECC BYTES
-.- " . . . . ------.v
I "
v /
•
1
•
,
/
V
CYLINDER ADDRESS
(0.410)
HEAD ADDRESS
\O-lHi
SAME AS HOME
ADDRESS
, I
DEFEcTIVE TRACK
=
USE CCHH OF ALTERNATE TRACK
ALTERNATE TRACK
=
USE CCHH OF DEFECTIVE TRACK
'DEFINES THE CONDITION OF THE TRACK.
"l
BITS 0-5 = UNUSED AND WRITTEN AS ZEROS
BITS 6-7
=
INDICATES CONDITION OF TRACK
00
=
NORMAL TRACK
01
=
ALTERNATE TRACK
10= DEFECTIVE TRACK
~UMBER
OF
THIS'
RECORD (1-31)
•
r -- . .
---~
NUMBER OF BYTES 1:,\
THE KEY FIELD (ZERO)
I
NlTMBER-OF BYTES-)Nl
THE DATA FIELD (288)
7 BYTES USED FOR ERROR DETECTION
AND CORRECnON
Figure 2 -9. R I Field
•
i