BASF 6104 LSI User manual

Technical
Manual
4“
x
MODEL 6104 LSI
FLOPPY DISK DRIVE
PART
No.
80307-
048
BASF Aktiengesellschaft
Datentechnik/OEM Vertrieb
Gottlieb-Daimler-Strafe 10
D-6800 Mannheim 1
Tel. 0621 - 4008380

REMARKS
REVISION RECORD OF REVISION
01 LSI - G VALID FOR LSI-VERSION
02 LSI - G CORRECTIONS
03 LSI - G CORRECTIONS

LIST
OF
CONTENTS
I - INTRODUCTION
1.1.
1.2.
1.6.
1.7.
1.8.
General
Related documentation
Description
Specification summary
- Options summary
1.5.1. Jumper selectable options
1.5.2. Factory installed options
Recording media
Recording formats
1.7.1. F M - encoding
1.7.2. M F M = encoding
Track format
1.8.1. Soft sectored track formats
1.8.1.1. IBM format for single density (FM)
1.8.1.2. IBM format for double density (MFM)
II - THEORY OF OPERATION
2.1.
2.2.
General
Functional description
2.2.1. Spindle drive system
2.2.2. Spindle system
2.2.3. Positioning system
2.2.4. Heads load mechanism
- Drive electronic description
2.3.1. Block diagram
2.3.2.
Large
scale
integrated
circuit
BASF
81041-001
2.3.3. Input interface
2.3.3.1. Input signals definitions and termination
13

Page 2 - List of contents (continued)
2.3.3.2. Select options 2-9
2.3.3.3. Side select options 2 - 10
2.3.3.4. Head load options 2 - 13
2.3.3.5. Radial step option 2- 14
2.3.4. Output interface 2-15
2.3.4.1. Output signals definitions 2-15
2.3.4.2. Options of the output interface 2 - 16
2.3.5. Stepper motor logic 2-17
2.3.5.1. Step control, step counter and decode 2 - 18
2.3.5.2. Modes of the stepper motor logic 2- 18
2.3.5.3. Stepper motor drivers 2 - 20
2.3.6. Track zero detector 2 - 21
2.3.7. Index/dual side detector and ready monitor 2 - 22
2.3.7.1. Index/dual detector 2 - 22
2.3.7.2. Ready monitor 2 - 23
2.3.8. Sector separator (Hardsector option) and sector
divider option 2 - 24
2.3.8.1. Sector separator 2 - 24
2.3.8.2. Sector divider option 2 - 24
2.3.9. Disk change logic 2 - 25
2.3.10. Heads load, door interlock and activity led drivers 2 - 26
2.3.10.1. Heads load driver 2 - 26
2.3.10.2. Door lock and activity driver 2 - 26
2.3.10.3. Door lock latch option 2 - 27
2.3.11. Side select circuits 2 - 28
2.3.12. Read/write circuits 2 - 29
2.3.12.1. Read/write head 2 - 29
2.3.12.2. Write circuits 2 - 30
2.3.12.3. Auto erase option 2 - 32
2.3.12.4. Write protect detector and write protect
option 2 - 33
2.3.12.5. Read circuits 2 - 34
2.3.13. Postcompensation option 2 - 38
2.3.14. DC - control and power on reset logic 2 - 39
2.3.15. - 5 V_ regulator 2 - 39
2.3.16. Data separator option 2 - 40
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Page 3 - List of contents (continued)
III - INSTALLATION AND OPERATION
3.1.
Installation
3.1.1. General
3.1.2. Unpacking and inspection
3.1.3. Connecting cables
3.1.4. Connectors
3.1.4.1. AC - power connector
3.1.4.2. DC - power connector
3.1.4.3. Signal connector
3.1.4.4. Interconnecting diagram
3.1.5. Logic levels and termination
3.1.6. Connecting configuration
3.1.6.1. Single drive configuration
3.1.6.2. Multiple drive configuration
3.1.7. Selection of the desired options
3.1.7.1. Select options
3.1.7.2. Side select options
3.1.7.3. Head load options
3.1.7.4. Radial step option
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- Radial ready option
-1.7.6. Radial index/sector option
-1.7.7. Hard sector and sector divider option
. Activity indicator / door lock options
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-1.7.9. Auto erase option
3.1.7.10. True/false data separator option
3.1.7.11. - 5 V_ regulator
é
3.1.8. Drive mounting
3.1.8.1. Mounting positions
3.1.8.2. Use of carrier springs
3.1.8.3. Mounting dimensions
Operation
3.2.1. General
3.2.2. Diskette storage and handling
3.2.3. Diskette laoding and unloading
3.2.4. Write protect
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Page
4 - List of contents (continued)
IV - MAINTENANCE
4.1.
4.2.
4.4.
General
Tools and test equipment
. Preventive maintenance
4.3.1. Visual inspection and cleanliness
4.3.2. Lead screw lubration
4.3.3. Read/write heads cleaning
4.3.3.1. Read/write heads cleaning with BASF
cleaning disk
4.3.3.2. Read/write heads cleaning without
cleaning disk
Checks, adjustments and replacements
4.4.1. PCB replacement
4.4.2. Spindle drive system
4.4.2.1. Drive motor aid drive belt checks
4.4.2.2. Drive motor speed check
4.4.2.3. Drive belt replacement
4.4.2.4. Drive motor replacement
4.4.3. Positioning system
-4.3.1. Track adjustment check
Track adjustment
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.
. .
. Track zero switch adjustment check
Track zero switch adjustment
. Track zero switch replacement
Outer stop adjustment check
. Outer stop adjustment
Inner stop adjustment check
Inner stop adjustment
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-10. R/W head - carriage replacement
4.4.4. Heads load mechanism
4.4.4.1. Heads load actuator check
4.4.4.2. Heads load actuator adjustment
4.4.4.3. Heads load solenoid replacement
4.4.5. Read/write electronics
4.4.5.1. Read amplitude check
4.4.5.2. Data separator adjustment check
4.4.5.3. Data separator adjustment (option)
4.4.6. Photo transistor and led's
4.4.6.1. Index detectors adjustment check
4.4.6.2. Index detectors adjustment
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Page S
LIST OF ILLUSTRATIONS
FIGURES
1-1
1-2
1-3
1-4
1-5
1 - 6
1-7
1-8
2-1
2-2
2-3
2-4
2-5
2 - 6
2-7
2-8
2-9
2 - 10
2-11
2-12
2 - 13
2-14
2-15
2 - 16
2-17
2 - 18
2- 19
2 - 20
2 - 21
2 - 22
2 - 23
2 - 24
2 - 25
2 - 26
: Model BASF 6104 double sided flexy disk drive
Flexible disk construction and dimension
: FM - encoding
: MFM - encoding
Cylinder and tracks
Soft sectored track format for single density (FM)
Simplified EDC shift register
Soft sectored track format for double density (MFM)
Positioning system and heads load mechanism
Block diagram BASF 6104 LSI
Input signal termination
: Radial select option
Binary select option
Side selection using the side select signal
Side selection by step in
Side selection using the select lines and radial select
: Side selection using the select 1/ line and binary select
: Select heads load
: Auto heads load
Radial heads load
Radial step option
Radial index/sector option
: Block diagram stepper motor logic
Stepper motor timing for 1 of 4 phases on with overlap
(standard configuration)
Stepper motor timing for 1 of 4 phases active
: Stepper motor timing for 2 of 4 phases active
: Stepper motor timing for 1 of 3 phases active
: Stepper motor driver circuit
: Track zero detector
Index and dual side detector
Ready monitor
Ready timing
Sector separator and sector divider option
: Timing diagram index - hard sector and sector divider
options
PAGE
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DO
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Page 6 - List of illustrations (continued)
FIGURES
2 27
2 28
2 29
2 30 :
2 31
2 32
2 33
2 34
2 35
2 36
2 37
2 38
2 39
2 40 :
2 41
2 42
2 43
2 44
2 45
2 46
2 47
2 48
2 49
2 50:
2 51
2 52
3 1
3 2
3 3
3 4
3 5
3 6
3 7
3 8
3 9
3 10 :
3 11
3 12
3 13
3 14
Disk change logic
: Timing diagram disk change
: Timing diagram door lock latch option
Heads load, activity-led / door lock drivers
Side select
: Track geometry
: Electrical connection of the read/write heads
Write initiative timing
Simplified write circuits
: Timing diagram write operation
: Auto erase option
: Erase delay timing
Write protect detector
Read circuits (simplified)
Read initiative timing
Read/write select logic
Read preamplifier and filter circuit
: Differentiator
Crossover detector and time domain filter
Read chain timing diagram
Postcompensation option
DC-control logic
- 5 V_ regulator simplified diagram
True/false data separator circuit
Timing diagram / false data separator
: Timing diagram / true data separator
Remove of shipping disk and shipping protection clip
: AC connector J 5
DC connector J 4
Interconnecting diagram
Interface logic levels
Recommended driver / receiving circuit
Single drive configuration
Radial select configuration
Daisy chain configuration
Carrier spring
Mounting dimensions BASF 6104 low profile design
: Mounting dimensions BASF 6104 rounded design
Diskette 1 oading
Write protected diskettes with write protect notch
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Page 7
TABLES
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LIST OF TABLES
Specification summary
: Options summary
Factory installed options
Input signals
: Decoding of the select lines by the binary select option
Side selection using the select lines and radial select
Drive and disk side when using select 1/ as side select
and binary select
Output signals
Stepper motor logic and jumper configuration
: Heads load options
: AC voltage requirements
DC power requirements
: Recommended J 3 mating connectors
Radial select option jumpering
: Binary select option jumpering
Side select options jumper table
: Head load options jumper table
: Hard sector and sector divider jumpering
: Activity indicator / door lock options
: True/false data separator jumper settings
Use of carrier springs
Diskette loading
: Diskette unloading
PAGE
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SECTION I
INTRODUCTION

1.1.
1.2.
GENERAL
This
manual
contains
descriptive
ma-
terial
and
procedures
to
aid
person-
nel
in
the
installation,
operation
,
maintenance
and
repair
of
the
BASF
6104
double
sided
floppy
disk
drive.
RELATED DOCUMENTATION
Interface
specification
no.
Parts
catalog
(attachment).
DESCRIPTION
This manual describes an enhanced ver-
sion of the BASF 6104 drive.
The BASF 6104 writes and _ reads in
single (FM) or double density (MFM or
M2FM) on one side of a standard dis-
kette or on both sides of a two si-
ded diskette. The storage capacity
(unformatted) of the BASF 6104 is
800 kbytes by using a single sided dis-
kette and 1600 kbytes by using a dou-
ble sided diskette. The BASF 6104 is
media compatible with the IBM 3740and
S/32 single sided drive as well as with
the IBM 4964 and 3600 series two sided
units by using the postcompensation
option. This option allowes the recor-
ding of double density diskettes with-
out using of any precompensation.
The diskette is rotated at 300 rpm
yielding a data transfer rate of
250 kbit/s in single density and 500 kbit/s
in double density recording.The step-
per motor positions the read _/ write
heads with a track to track access
time of 3 ms. The loading and unloa-
ding of the read/write heads are im-
proved by using of a liquid damper ,
which results in a high life time of
the heads and the diskette. In the e-
lectronic, a large scale integrated
circuit (LSI) is used, which contains
most of the digital control logic of
the drive. The LSI increases the re-
liability of the electronic and de-
creases the repair time.
FIGURE 1 - 1 : MODEL BASF
6104
DOUBLE
SIDED
FLEXY
DISK
DRIVE

1.
SPECIFICATION SUMMARY
A comprehensive list of principal spe-
cifications are provided in Table 1-1
The list defines both single-density
and double-density characteristics ,
both disk drive and interface
levels, and all physid¢al and electri-
cal parameters.
PERFORMANCE
CAPACITY
Unformatted
SPECIFICA TIONS
Single Density
Double Density
per Disk 800 kilcbytes 1 600 kilobytes
per Surface 460 kilobytes 800 kilobytes
per Track 5.2 kilobytes 10.4 kilobytes
IBM Format (128 byte sectors)
per Disk 500 kilobytes 1000 kilobytes
per Surface 250 kilobytes 500 kilobytes
per Track 3.33 kilobytes 6.66 kilobytes
TRANSFER RATE 250 kilobits/sec. 500 kilobits/sec.
Latency (Avg.) 83 ms 83 ms
ACCESS TIME
Track to Track 3 ms 3. ms
Average (including settling) 91 ms 91 ms
Settling Time 14 ms 14 ms
Head Load Time 40 ms 40 ms
FUNCTIONAL SPECIFICATIONS
Rotational Speed
Recording Densit
Flux Density
Track Density
Cylinder
Tracks
Heads
Sector
index
Enccding Method
Media
y (inside track) 3
Single Density
360 rpm + 2,5 %
408 bpi
816 fci
48 tpi
77
154
2
hard or soft
1
FM
BASF Flexy Disk 2
2
Double Density
360 rpm + 2,5 %
816 bpi
815 fci
48 tpi
77
154
2
hard or soit
]
MFM /M FM
BASF Flexy Disk 2)
2
TABLE 1-1
- SPECIFICATION SUMMARY

PHYSICAL
Environmental Limits
SPECIFICATIONS
Ambient Temperature 10° C to 50° Cc
Relative Humidity 20 % to 80 %
Maximum Wet Bulb 25° ¢
AC Power Requirements
SO Hz+ 2% Single Phase 220 VAC t 10% 0.3 A (Start-up 0.6 A)
DC Voltage Requirements +24 vpc = 5% 1.3. A typical
+5 vpc fr 5% 0.8 A typical
- 5 vpct 5% 0.05 A typ.
(option - 7 to - 16 VDC)
Mounting Dimensions *
Width 4 5/8 in. (110 mn)
Height 10 1/2 in. (220 mm)
Depth 14 1/4 in. (360 mm)
Weight 11,0 lbs. ( 5 kg)
Optional mounting available to allow
installation of 2 drives side by side
in RETMA 19 rack.
Heat Dissipation 300 BTU / hr. typical
RELIABILITY SPECIFICATIONS
MTBF 6 000 POH
MTTR 30 minutes
Useful Life 5 years or 20. 000 hours
Error Rates
Soft Read Errors 1 per 10 9 bits read
Hard Read Errors 1 per 10! bits read
Seek Errors 1 per 10 © seeks
TABLE 1 - 1
- SPECIFICATION SUMMARY (contd.)

1.5.
1.5.1.
OPTIONS SUMMARY
There are different options avail-
able for the BASF 6104. Most of the
options are selectable by jumpers
on the printed circuit board (PCB).
Some options must be ordered with
the drive or can be installed by
The following tables
different options.
the customer.
list all the
JUMPER SELECTABLE OPTIONS
The options of table 1-2 are selec-
table by setting of jumpers on the
PCB.
OPT
IONS FUNCTION
RADIAL
Allows the connection of 4
drives to the host system.
Each drive has its own ad-
dress (0, 1, 2, 3) selec-
table by a jumper.
SELECT
SIDE SELECT
The head 1 of the drive can
be selected in 3 modes ;
- using SIDE SELECT signal
- using STEP IN signal
- using SELECT 0-3 signals
HEAD LOAD
Loading of the heads can be
accomplished in three modes:
- selected heads load
(SELECT . HDLOAD)
- auto heads load (SELECT)
- radial heads load (HDLOAD)
AUTO ERASE
The erase turn-on and erase
turn-off delays are inter-
nally generated.
WRITE PROTECT
The
WRITE
PROTECT
signal
is
used
for
designating
of
spe-
cial
diskettes
and
not
for
write
protecting.
TABLE 1 -
2
OPTIONS
FUNCTION
DOOR LOCK
LATCH
Allows locking of the door
without maintaining the
IN USE signal activated by
storing the state of the
IN USE signal into the
IN USE - flip flop.
ACTIVITY
INDICATOR
AND ;
DOOR LOCK
Lighting of the activity LED
and locking of the door can
be accomplished as follows. :
1. if the heads are loaded
- if the drive is selected
- if the drive is ready
by the IN USE-signal
. by the IN USE-FF (DOOR
LOCK LATCH OPTION)
6. if one of 1
active
wm
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HY
to 3 or 4 is
7. if one of 1 to 3 or 5 is
active
8. if one of | to 3 or 4 or
5 is active
HARD SECTOR
For separating of INDEX and
SECTOR pulses. Usefull only
for hard sector diskettes.
-5V
REGULATOR
-5 V output voltage is gene-
rated when an input voltage
between -7 V and -16 V is
applied.
RADIAL READY
The READY signal is not
gated by SELECT.
RADIAL
INDEX/ SECTOR
The INDEX and SECTOR signals
are not gated by SELECT.
RADIAL STEP
The STEP and the STEP IN
signals are not gated by
SELECT.
OPTIONS SUMMARY

1.5.2. FACTORY INSTALLED OPTIONS
The following options are installed
in the drive at the factory or may
be installed by the customer.
RECORDING MEDIA
The BASF 6104 uses a removable single
sided or double sided diskette as
Storage medium. Fig. 1- 2 shows
construction and dimensions of a typ-
ical diskette.
The diskette is an oxide coated flex-
OPTIONS FUNCTION
BINARY SELECT Up to 8 drives may be multi-
plexed.
16 OR 8 SECTOR
DIVIDER
Divides the 32 SECTOR pulses
of the hard sectored diskette
by 2 or by 4.
TRUE OR FALSE
DATA SEPARATOR
For single density recording
(FM) only !
If the true data separator is
selected, IBM 3470 format is
accepted.
The circuit works as a simple
one shot separator if the
jumper is switched to the
false data separator.
POSTCOMPEN-
SATION
This option allows reading
and writing of double density
formatted diskettes without
using of any precompensation.
The drive is able to read
double density diskettes
written on IBM systems.
DOOR LOCK
SOLENOID
Locks the front door as long
as the solenoid is activated.
TABLE 1-3.
FACTORY INSTALLED OPTIONS
ible disk enclosed in a_ protective
plastic envelope with apertures for
head
contacts,
index
detection
and
spindle
loading.
The
dimensions
of
single
sided
and
the
double
sided
diskette
differs
only
in
the
location
of the index / sector holes.
The
optional
write
protect
hole
is
used
to
protect
the
written
data
on
the diskette.
SPINDLE /HUB SEALED
ACCESS PROTECTIVE
JACKET
203,2 om __
a-_—
“ ~y
7 N
iN
/ \_ | LNDEX/SEC
/ O-——_VT hoe
203,2 \
= |
, /
‘ y
Pts 7
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OXIDE COATED HEA:
MYLAR DISK APERTURE
LINER WRITE PROTECT
NOTCH
(OPTIONAL)
TRACK OO
TRACK 76
INDEX HOLE
Yo
FIGURE 1 - 2 . FLEXIBLE DISK CONSTRUCTION
AND DIMENSION

tem every pulse represents a flux
reversal on the diskette.
4 psec
BITCELL
k—
DATA pifipirpotrfoyoyotr tt DATA
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a
ior Sot Ro os ta,
\ 1 2 ps ‘ ' ' ‘ ( 1
poima Rp ry tt
' ' ‘ ' ' ' ' ' t
WRITE DATA WRITE
cpcpcbdDc cbdC c Cc codec
RECORDING FORMATS
The format of the data _ recorded on the
diskette depends on the host system.
There are two encoding schemes used
for the BASF 6104:
e FM (Frequency Modulation)
for single density.
e MFM _ (Modified Frequency Mo-
dulation)
for double density.
F M - ENCODING 1.7.2.
This scheme utilizes clocks to define
bit cell times. The presence of a
flux reversal between clock pulses is
The
of a flux reversal between clocks is
bit. On the
write data and read data interface
defined as a "one" bit. absence
"Vero"
defined as a
lines between disk drive and host sys-
FIGURE 1 - 3 FM - ENCODING
M F M - ENCODING
A flux transition is always recorded
at the center of the bitcell for each
"one" data bit. No flux transitionis
recorded for a "Zero" bit unless it
is not followed by another "Zero"bit.
In this case the flux transition is
provided at the end of the first bit
cell.
2 usec
BITCELL
— —
[LiTititotitofofofi]
roto y fo Foy i
1! t ' —+|3 As -—! 1
rot ot bas | '
ty ' ' p> \
DATA
Boe
soe
oe
D D OD D c oC D
FIGURE 1 - 4 . MFM- ENCODING