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~-------
'-iY
946261-9701
CONTROl.
CPU
TIl.INE
FUNCTION
WORD
ADDRESS
ADDRESS
o
F800
F802
FB04
3
F806
4
Faoa
FaOA
6
Faoc
F80E
(8)132878
FF-COO
FFCOI
FFC02
FFC03
FF'CQ4
FFC05
FFC06
FFC07
' "
DiSK
STATUS
COMMAND
FORMAT
AND
SEC'T'OR
CYl.INDER
COUIIIT
ADDRESS
SEl.ECT
AND MSB
ADDRESS
CONTROl.-
L.ER STATUS
STORE
REGISTERS DATA
FORMAT
* '" HEADER FORMAT
I
o
OL
-
OFF-LINE
NR
-
NOT READY
o
SPARE
3
6
WP
-
WRITE PROTECT
US
-
UNSAFE
4
5
6
7
I
TIH
DISK COMMANDS
o
o
o
o
o
o
o
o
a
I I
ATTN(O-3)
(Al.WAYS ONES)
12
ATTMSK(O- 3)
SI
-
SEEK INCOMPl.ETE
ATTN(N) X ATTMSK(N)
~
INTERRUPT
a
9
10
I I
12
13
14
SPARE
I
HEAD ADDRESS
STORE REGISTERS
*(SEE BELOW)
WRITE FORMAT
READ DATA
WRITE DATA
15
15
J
o
o
o
READ UNFORMATTED
WRITE UNFORMATTED
* * (SEE BELOW)
o
o
o
o
o
o
o
SEEK
(DUMMY -
SEE PARAGRAPH 3.5.2)
RESTORE
7
a
SECTORS PER RECORD
STARTING SECTOR ADDRESS
3
4
SPARE
4
CYLINDER ADDRESS
BITS
0-14
=
WORD
COUNT
(BITS 0-15 • EVEN BYTE COUNT)
MEMORY ADDRESS (l.SB)
7
8
UNIT SEL.
o
I
2
3
SPARE
7
10
11
M EMORY ADDRESS
(MSB)
12
ERR
-
ERROR
DE -
DATA ERROR
CT -
COMMAND TIMER
INT
-
INTERRUPT ENABL.E
TT -
TIl.INE TIMEOUT
SE -
SEARCH ERROR
AC
-
ABNORMAl. COMPLETION
IE -
10 ERROR
UE -
UNIT ERROR
0
WORDS PER TRACK
0
7
8
SECTORSfTRACK
OVERHEAD/RECORD
0
4
5
TRACKS/CYLINDER
1
0
CYl.INDERNNIT
0
4
S
HEAD
CYl.INDER
0
7
8
SECTORS;RECORD
SECTOR ADDRESS
0
RECORD WORD COUNT
15
15
15
15
15
15
15
I
15
I
15
15
I
15
Figure 3-1. Model OSlO Disk System Control Word Formats
3-2
Digital Systems Division
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