Honeywell 6000 Series Reference Manual page 21

N
,
'"
o
tlj
W
-J
THIS BYTE WRITTEN AT THE
END OF HOME ADDRESS. COUNT.
AND DATA FIELDS TO IDENTIFY
THE DEVICE AND CHANNEL
NUMBER USED WHEN THIS BYTE
WAS WRITTEN ON THE TRACK
DEVICE
NUMBER
1 BYTE
ALL SPLICES MADE IN THIS AREA
GAP 2
SYNC HEX 19 IDHEX19
, I
RO FIELD: LTSED BY OPERATING SYSTEM FOR
ADDRESS OF ALTERNATE TRACK OR DEFECTIVE
TRACK .
• GAPS ALLOW TIME TO CHANGE FROJ\t READ
TO WRITE STATE OR WRITE TO READ STATE::.
• SYNC AND ID HEX 19 SAME AS GAP 1.
v •
RODATA
GAP
::? ROCOUNT
GAP 2
8+ 7 EU ..
-tH
nYTES
11 + 7 UYTES
49 BYTES
BYTES
RO DATA FIELO:
8
BYTES
o (OLST FIELD HAS THE SA~tE CCHH AS
O~lE
ADDRESS EXCEPT \\,HE:\ L'SED FOR
TER~ATE OR DEFECTIVE TRACK ADDRESS
, - r- "
PHYSICAL
ADDRESS
FLAG CYLINDER CYLINDER HEAD HEAD RECORD
•
SAME AS HOME
ADDRESS
•
" " J
V V
CYLINDER ADDRESS HEAl) ADDRESS
( 0-4 H) I " II· 1 H) ,
/
..
DEFECTIVE TRACK
=
l'SE CCHH Of ALTER:"oIATE TRACK
ALTERNATE TRACK
=
USE CCHH Of DEfECTIVE TRACK
•
NUMUER OF THIS}-
RECORD (ZERO)
rDEFINES THE CONDITION OF THE
TRAC-K~
81TS
0-5
=
UNUSED AND WRITTEN AS ZEROS
81TS 6· 7
=
INDICATES CONDITION OF TRACK
00
=
NORMAL TRACK
01
=
ALTERNATE TRACK
10
=
DEFECTIVE TRACK
NUMUER OF IWTES IN
THE KEY FIELD (ZERO)
Figure 2 -8. RO Field
KEY LE:'\GTH
•
D:~ T:~
LE:-';GTH
D:~TA
LE:-';GTH
,
,
V
:,\L'\lBER OF BYTES 1:,\
THE DATA FIELD 8
7 ECC BYTES
•
I
7 BYTES l'SED FOR ERROR
DETECTIO~
I
A:,\D CORRECTIO:'\