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SWITCH AND JUMPER FUNCTIONS
a:::::J~
_
ON
=
Write Protected
SPINDLE START-UP
SWITCH POSITION
All swnches and jumpers must be set before applying power to the drive. See the
a:::::J
C")
OFF
=
Write Unprotected
DELAY
2
3
figure below for location of jumpers and sw"ches on the PCB board and what
a:JN
}
Spindle StarHip Delay
( . . Table)
oSecondt
OFF
OFF
functions they perform.
(~
_
ON
=
Hard Sector Mode
8 Seconds
OFF
ON
/
OFF
=
Soft
Sector
Mode
16 Seconds
ON
OFF
ON
24 Seconds
ON
ON
!~(
SW1 (Switch 1) Functions
DRIVE SELECT
fBBBB
1
2
3
DRIVE
i
ITEOM~~1
(21)
(2')
(2')
10
1 234
OFF
OFF
ON
1
OFF
ON
OFF
2
0rN:±:
1*
FACTORY
SW1
V
OFF
ON
ON
3
~:~
PJsidiJ
.~~
ON
OFF
OFF
4
ig~-
r--
I
I
J
.......
PJ7 JUMPER FUNCTIONS:
When operating in the hard sector mode, jumper PJ7 is used to set the sector length
and the number of sectors per track. To determine sector parameters, it is
necessary to calculate the unformatted bytes per sector, which in turn depends on
usable sector length and sector overhead, as follows:
Unformated bytes per sector
=
usable sedor length
=
overhead.
Usable sector length is selected to meet system file size requirements. Overhead
depends on controller format, but is typically 64 bytes in hard sector mode. After the
value of unformatt b es e secto is eter i ed he n
f ecto
r ac
ed yt p r
r d
m n , t
umber
0
s
rs pe tr k
is calculated as follows:
Sectors per track
=
20 832 (number of bytes per track)
Unformatted bytes per sedor
The result of this calculation is rounded to the next lower whole number. This
number represents the number of whole sectors per track. To set number of sectors
per track in the the drive, the PJ7 jumpers are configured to a binary value that is
one less than the number of whole sectors per track. In most case, the sectors will
not exactly fill the whole track, leaving some residual bytes. If SW2 swnch pos"ion
4 is OFF, any residual bytes will be added into the last sector. If SW2 Switch position
is ON, any residual bytes will be added as an extra sector.
TERMINATION:
When daisy chaining drives: the last physical drive in the daisy chain must be
terminated. Removing the terminator pack un-terminates the drive.
"
ON
OFF
ON
5
• SwItch 4.ta ahortor long
last
ON
ON
OFF
6
ON
ON
ON
7
aectormode
SW2 (Switch 2) Functions
Jumoer Pin Position
8
7
6
5
4
3
2
1
Binary Value
128
64
32
16
8
4
2
1
PJ7 Jumper
OUT
IN
OUT
OUT
OUT OUT
OUT OUT
Note: Jumper IN
=
1 .. Jumper OUT
=
0
PJ7 Jumpers for 65 x 256 byte Sectors per Track
Jumper Pin Position
8
7
6
5
4
3
2
1
Binary Value
128 64
32
16
8
4
2
1
108 Sectors w/128 User Bytes
OUT IN
IN OUT IN OUT IN
IN
Binary value
=
107
65 Sectors with 256 User Bytes
OUT IN OUT OUT OUT OUT OUT OUT
Binarv value
=
64
36 Sectors with 512 User Bytes
OUT OUT IN OUT OUT OUT IN
IN
Binary value
=
35
19 Sectors with 1024 User Bytes
OUT OUT OUT IN OUT OUT IN OUT
Binarv value
=
18
Note: Jumper IN
=
1 .. Jumper OUT
=
0
Common PJ7 Jumper Configurations
DRIVE GEOMETRY
MK153FA
MK154FA
MK156FA
Capacity (unformatted)
86.5 MB
121 MB
173 MB
Number of Cylinders
830
830
830
Number of Heads
5
7
10
Number of Bytes
20,832
20,832
20,832
Per Track (Unformatted)
TECHNICAL SUPPORT
Should you require any technical support, contad your computer distributor. If your
distributor is unable to answer your questions, have them call the Toshiba Disk
Products Divisional Office, on your behalf.
Call from in front of the computer. Know as much about your system software and
hardware, particularly any non-standard hardware (which may have not been
considered by designers) .In general, technical support specialists have experience
with a particular ·wedge· of the computer market, and may not have the background
to support your particular application(s). (Many problems are caused by the
interaction of two or more products in your compter, not with your computer "self.)
TECHNICAL SUPPORT NUMBERS
Cambridge, MA --617/354-6720
San Jose, CA ---408/452-8179
Dallas, TX --2141991-5979
Irvine, CA--714/455-0407
Rev.
01
2
MK-1S0FA Installation Manual
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