Shugart SA800 Installation and operation manual

SA800/801
Diskette
Storage Drive
~ .. Shugart

TABLE OF CONTENTS
1.0 Introduction ' 1
1.1 General Description 1
1
.2 Specification Summary 2
1
.2.1 Performance Specifications 2
1.2.2 Functional Specifications 2
1.2.3 Physical Specifications 2
1.2.4 Reliability Specifications 3
2.0 Functional Characteristics 5
2.1 General Operation 5
2.2 Read/Write and Control Electronics , 5
2.3 Drive Mechanism 5
2.4 Positioning Mechanism 5
2.5 Read/Write Head 5
2.6 Recording Format 6
2.7 Optional Features 6
2.8 Model Differences 6
3.0 Functional Operations 7
3.1 Power Sequencing 7
3.2 Drive Selection 7
3.3 Track Accessing 7
3.3.1 Step Out 7
3.3.2 Step
In 7
3.4 Read Operation 7
3.5 Write Operation ,
.. , , .. , , 9
3.6 Sequence of Events ' 9
4.0
Electric~llnterface 13
4.1 Signal Interface .. , , , 13
4.1.1 Input Lines 13
4.1.1 Input Line Termination 15
4.1.1.2 Drive Select 1-4 , , 15
4.1.1.3 Direction Select , , , . , 15
4.1 .1 .4 Step ,15
4.1 .1 .5 Write Gate ,15
4.1.1.6 Write Data , . ,
.. ,16
4.1.1.7 Head Load (Alternate Input) 16
4.1.1.8
In Use (Alternate Input) .. , .. , . , , , 16
4.1.2 Output Lines 16
4.1.2.1 Track 00 , . , , ' 16
4.1.2.2 Index '.' 16
4.1 .2.3 Sector (SA801 only) '.' 17
4.1 .2.4 Ready 17
4.1 .2.5 Read Data 17
4.1 .2.6 Sep Data 17
4.1.2.7 Sep Clock 17
4.1.2.8 Write Protect (Optional on SA800) 17
4.1.2.9 Disk Change (Alternate Output) 18
4.1 .3 Alternate I/O Pins 18
4.2 Power Interface 18
4.2.1 AC Power 18
4.2.2
DC Power 19

5.0 Physical Interface :21
5.1 J1/P1 Connector :21
5.2 J5/P5 Connector :22
5.3 J4/P4 Connector :22
6.0 Drive Physical Specifications :23
6.1 Drive Dimensions :23
6.2 Mounting Recommendations :23
6.2 .. 1Vertical Mounting :23
6.2,,3 Upright Mounting " ' :23
6.3 Chassis Slide :25
6.4 Decorative Face Plate :25
7.0 Customerlnstallable Options :27
7.1 0rive Select -One to Eight Drives ................................................... :30
7.2 Select Drive Without Loading Head or Enabling Stepper Motor :31
7.3 Select Drive and Enable Stepper Without L.oading Head :32
7.4 Load Head Without Selecting Drive or Enabling Stepper :32
7.5 Radial Ready '33
7.6 Radiallndex/Sector 34
7.7Eight, 16, Or 32 Sectors 35
7.8 In Use Alternate Input (Activity LED) :36
7.9 Write Protect Optional Use 36
7.10 Disk Change (Alternate Output) ' 37
8.0 Operation Procedures 38
8.1 Diskette Loading and Handling 38
8.2 Write Protecting aDiskette . ' 39
9.0 Error Detection and Correction ' 40
9.1 Write Error 40
9.2 Read Error 40
Appendix A- Models and Features .'.' 41
ii

LIST OF ILLUSTRATIONS
Figure 1. SA800/801 Diskette Storage Drive ........................ .iv
2. SA800/801 Functional Diagram ......................... 4
3. Track Access Timing . . 8
4. Read Initiate Timing ......................... . 8
5. Read Signal Timing. ......................................... . 9
6. Write Initiate Timing. ............................... ..10
7. Write Data Timing. ........................... ........ . 10
8. General Control and Data Timing Requirements ........................ . 11
9. Interface Connections ........................................ . .. 14
10. Interface Signal Driver/Receiver ..........
.. .................... ...... .. . .... 16
11. Index
Timing. ............................................... ....... . .. 16
12. Sector Timing ............................................... .
17
13. J1 Connector Dimensions . 21
14. J5 Connector . . 22
15. J4 Connector .22
16. InterfaceConnectors-Physical Location Diagram ....................
.. . . . 22
17. Head Load Actuator Mounting Prerequisites. ....................... . .. 23
18. SA800/801 Diskette Storage Drive Dimensions
24
19. Slide Mounting Dimensions .......................................... ..25
20. SA800/801 RDimensions ................................................... 26
21. Component Locations Standard
PCB 28
22. Component Locations
LSI PCB , ,........................... . 29
23. Drive Select
Circuitry. ........................................... .. ........ ..30
24. Select
Drive Without Loading Head Circuit . . 31
25. Stepper Motor Enable Circuit. ............................. .. . . . . . . . . . . . . . . . . .. .. 32
26. Load Head Without Selecting Drive or Enabling Stepper Circuit ................. 33
27. Radial Ready
Circuit. .................................................. . ... 34
28. Radial Index/Sector Circuit. .................................... 34
29. Sector Timing Relationships. . .. ......................................... . 35
30. Sector Divide Circuit. .......................................... .
35
31. In Use/Activity LED Circuit 36
32. Write Protect Circuit. .................................................. . 36
33. Disk Change Timing .................................................... .. 37
34. Disk Change Circuit ................................................ . 37
35. Loading SA800/801 .............................. ........... . 38
36. Diskette Write Protected .39
37. Write Inhibit Notch Specifications .................................... 39
iii

SR800
Figure 1. SASOO/S01 Diskette Storage Drive
iv

1.0 INTRODUCTION
1.1 General Description
The SA800/80l are enhanced versions of the successful SA900/901 Diskette Storage Drive. The SA800/801
provides the customer with amature and reliable product, manufactured to the same high standard of ex-
cellence as the 900/901, but with additional featuress.
The SA800 Diskette Storage Drive can read and write diskettes for interchange with other SA800's, the
SA900, IBM
3741,3742 or 3540 and with the IBM System 32.
The
SA801 provides the same features as the SA800 with additional flexibility for those requirements which
preclude IBM compatibility.
The SA800/801 Diskette Storage Drives have as standard features: apatented diskette clamping/registra-
tion design which eliminates the possibility of damage to the diskette due to misregistration and quarantees
over 30,000 interchanges with each diskette; single and double density capability
on the same drive for the
same price; aproprietary ceramic
R/W head designed and manufactured by Shugart Associates to provide
media life exceeding 3.5 million passes/track and head life exceeding 15,000 hours;
an activity light which
indicates drive
in use; and ribbon cable or twisted pair connector for ease of packaging. All of these features
and more are available with
the SA800/801.
SA800/801 Diskette Storage Drive provide the system designer solutions to his applications requirements
with greater performance and reliability than cassette or cartridge drives, and lower cost with increased
function over I/O and reel-to-reel tape drives.
Applications for the SA800/801 Diskette Storage Drive are key entry systems, point of sale recording
systems, batch terminal data storage microprogram load and error logging, minicomputer program and aux-
iliary data storage, word processing systems and data storage for small business systems.
The SA100 Diskette, IBM Diskette or equivalent, can
be read and written interchangeably between any
SA800 and IBM 3741/42, 3747 and 3540. The
SA 101 Diskette can be read or written interchangeably on any
SA801. The
SA 102 and SA 103 are used for double density applications.
As a product enhancement, to improve reliability and serviceability, Shugart is incorporating into the SABOO
serves drives a PCB Large Scale Integration (LSI) components. These components are:
•Control Chip
•Write Channel
•Read Channel
The LSI Control chip performs the following functions:
•
TRK 00 detector
•Index detector
•Stepper logic
•FM clock/data separator and data window
•Sector separator
•Write Protect
detector
•Door open/close detector
•Disk change circuit
•Ready signal
The functions listed above are either detected from the drive mechanics or from the Host Interface. As a
result, the proper logic generated by the LSI chip either will be used within the drive electronic circuit to per-
form stepping, read/write operations
or will be fed back to the Host Interface.
Also, an internal FM data separator is incorporated inside the chip. A
jumper option will allow the user to
select the data separator to perform as its predecessor SABOO (jumper FS) or to select the separator to be
compatible with the IBM System 3740 data separator(jumper
TS). Thus IBM compatibility will allowdirect in-
terfacing with LSI single chip floppy disk controllers.

1.2 Specification Summary
1.2.1 Performance Specifications
Capacity
Unformatted
Per Disk
Per Track
IBM Format
Per Disk
Per
Track
Tranfer Rate
Latency (average)
Access Time
Track to Track
Average
Settling Time
Head Load Time
Single Density
3.2 megabits
41 .7 kilobits
2.0 megabits
26.6 kilobits
250 kilobits/sec.
83
ms
8 ms
260·ms
8 ms
35 ms
Double Density
6.4 megabits
83.4 kilobits
n/a
n/a
500 kilobits/sec
83
ms
8 ms
260 ms
8 ms
35 ms
1.2.2 Functional Specifications
Rotational Speed
Recording Density
(inside track)
Flux Density
Track Density
Tracks
Physical Sectors
SA800
SA801
Index
Encoding Method
Media Requirements
SA800
SA801
1.2.3 Physical Specifications
Single Density
360 rpm
3200 bpi
6400 fci
48 tpi
77
o
32/16/8
1
FM
SA100IIBM Diskette
SA101
Double Density
360 rpm
6400 bpi
6400 fci
48 tpi
77
o
32/16/8
1
MFM/M
2FM
SA10211BM Diskette
SA103 .
Operating
=40°F to 115°F (4.4° to 46.1 DC)
= 20% to 80%
=78°F (25°C) .
Enviromental Limits
Ambient Temperature
Relative
Humidity
Maximum Wet Bulb
AC Power Requirements
50/60 Hz ±0.5 Hz
100/115 VAC Installations =85 to 127V @.3A typical
200/230 VAC Installations =170 to 253V @.18A typical
DC Voltage Requirements
+ :24 VDC ± 5% 1.3A typical
+5VDC ± 5% 0.8A typical
t -5 VDC ±5
%.05A typical (option
-7 to -16 VDC)
Mechanical Dimensions (Reference Figures 18 and 20)
Width = 4 5/8 in. (11.75 cm)
Height - 9 1/2 in. (24.13 cm)
Depth -- 14 1/4 in. (36.20 cm)
Weight =13.0 Ibs. (5.91 kg)
Heat Dissipation =
271 BTU/hr. typical (80 Watts)
tMinus voltages are not required .tor SA800L.
2
Shipping
-40°F to 144°F
1to
95%
No Condensation
Storage
-BoF to 117°F
1to 95%
No Condensation

1.2.4 Reliability Specifications
MTBF:
PM:
MTTR:
Component Ufe:
Error Rates:
Soft
Read Errors:
Hard Read Errors:
Seek Errors:
Media Ufe:
Passes Per Track
Insertions:
5000
POH under heavy usage
8000
POH under typical usage
Every 5000
POH under heavy usage
Every 15,000 under typical usage
30 minutes
15,000 POH
1per 109bits read
1per 1012 bits read
1per 106seeks.
3.5 X106
30,000 +
3

V'JR!TE PROTECT LED
WRITE PROTECT DETECTOR
INDEX
DETECTOR
___ ~I
~~
,,~
L.-a ---- "~, l ~
'~~/
/"~~
"~
~~
I"
READ HEADI
I
I
I
I
I
I
I
INDEX LED
STEPPER 03
INDEX DETECTOR
STEPPER 01
STEPPER 02
TRACK 00 DETECTOR
WRITE HEAD
HEAD LOAD SOLENOID
ACTIVITY LIGHT ~ ~
TRACK 00 LED .. ~
WRITE
LOGIC
DRIVE
SELECT
READ
LOGIC
CONTROL
LOGIC
(HEAD LOAD)
(IN USE)
(DiSK CHANGE)
DRIVE SELECT
SEP DATA
POWER ON
RESET
SECTOR (SA801)
READY
INDEX
WRITE GATE
STEP
DIRECTION SELECT
WRITE DATA
SEP CLOCK
READ DATA
DRIVE SELECT (4 LINES)
TRACK 00
WRITE PROTECT (optional)
"T1
cO"
-e
...
CD
~
~
(J)
»
ex>
0
0
05
0
.....
11
C
::J
~
o·
::J
~
0
05"
<0
Q)
3

2.0 FUNCTIONAL CHARACTERISTICS
2.1 General Operation
The SA800/801 Diskette Storage Drive consists of read/write and controls electronics, drive mechanism,
read/write head, track positioning mechanism, and the removable diskette. These components perform the
following functions:
Interpret and generate control signals.
Move read/write head to the selected track.
Read and write data.
The relationship and interface signals for the. internal functions of the SA800/801 are shown in Figure 2.
The Head Positioning Actuator positions the read/write head to the desired track on the diskette. The Head
Load Actuator loads the diskette against the read/write head and data may then
be recorded or read from
the diskette.
2.2 Read/Write and Control Electronics
The electronics are packaged on one PCB. The PCB contains:
1. Index Detector Circuits. (Sector/Index for 801).
2. Head Position Actuator Driver.
3. Head Load Actuator Driver.
4. Read/Write Amplifier and Transition Detector.
5. Data/Clocl< Separation Circuits.
6. Write Protect.
7. Drive Ready Detector Circuit.
8. Drive Select Circuits.
2.3 Drive Mechanism
The Diskette drive motor rotates the spindle at 360 rpm through abelt-drive system. 50 or 60 Hz power is ac-
commodated by changing the drive pulley and belt. Aregistration hub, centered
on the face of the spindle,
positions the Diskette. Aclamp that moves
in conjunction with the cartridge guide fixes the Diskette to the
registration hub.
2.4 Positioning Mechanism
An electrical stepping motor (Head Position Actuator) and lead screw positions the read/write head. The
stepping motor rotates the lead screw clockwise or counterclockwise in 15° increments. A 15° rotation of the
lead screw moves the read/write head one track position.
The using system increments the stepping motor
to the desired track. .
2.5 Read/Write Head
The SA800/801 head is asingle element ceramic read/write head with straddle erase elements to provide
erased areas between data tracks. Thus normal interchange tolerances between media and drives will not
degrade the signal to noise ratio and insures Diskette interchangeability.
The read/write head is mounted
on acarriage which is located on the Head Position Actuator lead screw.
The Diskette is held in aplane perpendicular to the read/write head by aplaten located on the base casting.
This precise registration assures perfect compliance with the read/write head.
The Diskette is loaded
against the head with aload pad actuated by the head load solenoid.
The read/write head
is in direct contact with the Diskette. The head surface has been designed to obtain
maximum signal transfer to and from the magnetic surface of the Diskette with minimum head/Diskette
wear.
5