Shugart SA810 Page 39 Owner'S Manual Download | Manualshive

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Summary of Contents for SA810

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Page 2: ...p In 1 6 1 4 7 Side Selection SA860 Only _ __ 1 7 1 4 8 Read Operation 1 8 1 4 9 Write Operation 1 9 1 4 10 Sequence of Events 1 10 SECTION II ELECTRICAL INTERFACE 2 1 2 1 Introduction 2 1 2 2 Signal Interface 2 1 2 2 1 InputLines 2 1 2 2 2 Input Line Termination 2 3 2 2 3 Drive Select 1 4 2 3 2 2 4 Side Select SA860 Only 2 3 2 2 5 Direction Select 2 4 2 2 6 Step 2 4 2 2 7 Write Gate 2 4 2 2 8 Wri...

Page 3: ...ing Format 6 3 6 4 4 Soft Sector Recording Format 6 3 6 4 5 Typical Track Index Format 6 3 SECTION VII CUSTOMER INSTALLABLE OPTIONS 7 1 7 1 Introduction 7 1 7 2 External Write Current Switch 7 5 7 3 Two Sided Status Optional Output SA860 only 7 5 7 4 Disk Change Optional Output 7 5 7 5 Side Selection Using Direction Select SA860 only 7 6 7 6 Side Selection Using Drive Select SA860 only 7 6 7 7 In ...

Page 4: ...ard Sector Recording Format FM 6 4 6 7 MFM Track Format Comparison 6 5 6 8 MFM Index Pre Address Mark 6 6 6 9 Index Address Mark FM 6 6 6 10 MFM Index Address Mark 6 7 6 11 10 Address Mark FM 6 7 6 12 MFM 10 Address Mark 6 7 6 13 MFM Pre ID Data Address Mark 6 8 6 14 Data Address Mark FM 6 8 6 15 Deleted Data Address Mark FM 6 8 6 16 MFM Data Address Mark 6 9 6 17 MFM Deleted Data Address Mark 6 9...

Page 5: ...DS Drive Select PLL Phase Locked Loop FM Frequency Modulation SEP Separated 10 Index VFO Variable Frequency Oscillator LED Light Emitting Diode WG Write Gate ABOUT THIS MANUAL This manual P N 39216 2 supersedes all earlier manuals All earlier editions may be discarded While every effort has been made to ensure that the information provided herein is correct please notify us in the event of an erro...

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Page 7: ...FIGURE 1 1 SA810 860 HALF HEIGHT FLOPPY DISK DRIVE 1 0 ...

Page 8: ...M Bytes unformatted capacity 1 Write protect and programmable door lock for improved data security m Internal write current switching n TRUE READY alerts the system that the drive is ready to send or receive data o Buffered seek p Single or multiple drive dc Motor On control q Multiple jumper options r Shugart s proprietary Bi Compliant read write heads with straddle erase elements s Extended reli...

Page 9: ...2 3 Physical Specifications Environmental Limits Ambient Temperature Relative Humidity Maximum Wet Bulb DC Voltage Requirements Operating 50 to 115 F 9 9 to 46 1 C 20 to 80 85OF 29 4 C Storage 8 to 122 F 22 2 to 50 C 1 to 95 no condensation 24 00 2 4 V dc 1 0 A typ 1 7 A max 100 mV ripple 5 00 0 25 V de 0 7 A typ 1 0 A max 50 mV ripple NOTE SA860 Single Double Density 500 1000 k bytes 250 500 k by...

Page 10: ...per 106 seeks Passes per Track 3 5 x 106 Insertions 30 000 1 3 FUNCTIONAL CHARACTERISTICS The 810 860 floppy disk drives consist of a Read Write and Control Electronics b Drive Mechanism c Precision Track Positioning Mechanism d Read Write Head s 1 3 1 Electronics The electronics are packaged on one PCB which contains a Index Detector Circuits Sector Index for Hard Sectored Media b Head Position A...

Page 11: ...mat of the data recorded on the diskette is totally a function of the host system This format can be designed around the user s application to take maximum advantage of the total available bits that can be written on anyone track Figure 1 2 provides a functional diagram of the SA810 860 For a detailed discussion of the various recording for mats refer to Section VI 1 4 FUNCTIONAL OPERATIONS 1 4 1 ...

Page 12: ... SIDE ASSM 40 SELECT POWER ON DOOR RESET MOTOR CLOSED SIDE SELECT SWITCH STEP I DIRECTION SIDE SELECT OPT INDEX DRIVE SIDE SELECT OPT SECTOR DETECTOR MOTOR ON HEAD LOAD OPT L IN USE OPT t TWO SIDED OPT CONTROL TRACK 00 LOGIC INDEX IN USE p LED SECTOR READY TRUE READY OPT TRACK 00 TRUE READY OPT SENSOR _ DISK CHANGE OPT ALTERNATE I O 2 lines DOOR LOCK SA860 ONLY SOLENOID FIGURE 1 2 SA810 860 FUNCTI...

Page 13: ...reater than 15 p S will be stored in a buffer which will then issue step commands to the drive stepper motor at a 3 ms pulse rate Pulses received at greater than a 3 ms period will step the drive at the same rate they are received The first step begins upon receipt of the first step pulse 1 4 5 Step Out With the DIRECTION SELECT line at a plus logic level 2 5 V to 5 25 V a pulse on the STEP line w...

Page 14: ...n a 3 ms per iod will step the drive at the same rate they are received The first step begins upon receipt of the first step pulse 39216 31 FIGURE 1 4 TRACK ACCESS TIMING BUFFERED SEEK 1 4 7 Side Selection SA860 Only Head selection is controlled via the I O signal line designated SIDE SELECT A plus logic level on the SIDE SELECT line selects the read write head on the side asurface of the diskette...

Page 15: ...MINAL POSITION B LEADING EDGE OF BIT MAY BE 200 ns FROM ITS NOMINAL POSITION FIGURE 1 6 READ SIGNAL TIMING FM ENCODING 39216 05 The encoding scheme of the recorded data can be FM or MFM The first of these FM provides single density recording The superior efficiency of MFM permits the bit cell period to be half that of the FM code thereby pro viding double density recording Differences among FM and...

Page 16: ... to the SA810 860 is accomplished by a Activating DRIVE SELECT line b Selecting head c Activating WRITE GATE line d Pulsing WRITE DATA line with data to be written e Head current switching The timing relationships required to initiate a write data sequence are shown in figure 1 8 These timing specifica tions are required in order to guarantee that the read write head position has stabilized prior ...

Page 17: ...4 ls MIN I L16 lnf1ru I 1 MIN r 50 ls MIN NO TE l tnfWJ NOTE 1 165 ms minimum delay must be introduced after DRIVE SELECT to allow time for the dc motor to reach 360 rpm or the optional TRUE READY line must be monitored NOTE 2 If performing standard seeks the minimum frequency is 3 ms between steps If utilizing the drive in the buffered seek mode of operation the frequency shall be 15 p s to 2 9 m...

Page 18: ...nector Pl J1 2 2 1 Input Lines There are twelve signal input lines Nine are standard and three are user installable options refer to Section VII The input signals are of three types those intended to be multiplexed in a multiple drive system those not intended to be multiplexed and those which will perform the multiplexing The input signals which are intended to do the multiplexing are a DRIVE SEL...

Page 19: ...SIDE SELECT OPT DRIVE SELECT 4 SIDE SELECT OPT DIRECTION SELECT SIDE SELECT OPT STEP WRITE DATA WRITE GATE TRACK 00 WRITE PROTECT READ DATA SEP DATA SEP CLOCK 5 V DC X 5 V RETURN 24 V DC X 24 V RETURN TWISTED PAIR JUMPER ENABLED ALTERNATE I O LINES SA860 ONLY SA8101860 J1 2 1 8 7 10 9 12 11 14 13 16 15 18 17 20 19 22 21 24 2 3 26 25 28 27 30 29 32 31 34 33 36 35 38 37 40 39 42 41 44 4 46 45 48 47 ...

Page 20: ...l enables the multiplexed I O lines starts the spindle motor energizes the stepper motor locks the door and lights the activity LED In this mode of operation only the drive with this line active will respond to the input lines and gate the output lines Four separate input lines DRIVE SELECT 1 DRIVE SELECT 2 DRIVE SELECT 3 and DRIVE SELECT 4 are prOVided so that up to four drives may be multiplexed...

Page 21: ...me between pulses having a1 P s minimum pulse width Any change in the DIRECTION SELECT line must be made at least 1 P s minimum before the leading edge of the STEP pulse Refer to figure 1 3 for these timings Buffered stepping may be done by issuing pulse s to the drive at a rate of 15 P s minimum to 2 9 ms maximum time between pulses having a 1 p S minimum pulse width Pulses are stored in a buffer...

Page 22: ...ion to the logical zero level for a period of 0 2 to 2 4 ms once each revolution The timing for this signal is shown in figure 2 3 To correctly detect INDEX at the control unit INDEX should be false at DRIVE SELECT time that is the controller should see the transition from false to true after the drive has been selected INDEX pulses will only be provided when the diskette is up to speed U 0 2 to 2...

Page 23: ...nal is prOVided by the drive to give the user an indication when a write protected diskette is install ed This signal is a logical zero level when it is protected Under normal operation the drive will inhibit writing with a protected diskette installed in addition to notifying the interface For other methods of using write protect refer to paragraph 7 13 2 2 21 True Ready This output pin 8 signals...

Page 24: ... DC VOLTAGE TOLERANCE CURRENT MAX RIPPLE p to p 1 24 V DC 2 4 V DC 1 7 A MAX 100 mV MAX ALLOWABLE 1 0 A MAX 2 24 V RETURN 3 5V DC 0 25 V DC 1 0 A MAX 50 mV MAX ALLOWABLE 0 7 A TYP 4 5 V RETURN 5 FRAME GROUND If the stepper motor is energized by the controller during the spindle motor start up time the drive will exceed the 24 V DC current specification of 1 7 A max Under this condition the current...

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Page 26: ...hrough a 50 pin PCB edge connector The dimensions for this connector are shown in figure 3 2 The pins are numbered 1 through 50 with the even numbered pins on the component side of the PCB and the odd numbered pins on the non component side Pin 2 is located on the end of the PCB connector closest to the dc connector and is labeled 2 A key slot is provided between pins 4 and 6 for optional connecto...

Page 27: ... _ _ __ 1 0 063 0 160 r NOM 2X _________ 2 575 0 010 t 6 541 0 025 NOTE x xxx x xxx in x xxx x xxx em 3 3 J2 P2 CONNECTOR BOARD THICKNESS 0 062 0 007 0 157 0 017 50574 19 FIGURE 3 2 J1 CONNECTOR DIMENSIONS The dc power connector J2 is mounted on the component side of the PCB and is located near the stepper motor J2 is a 5 pin AMP Mate N Lok connector PIN 1 350945 0 The recommended mating connector...

Page 28: ...ONS See figure 4 1 for the dimensions of the SA810 860 4 3 MOUNTING The SA810 860 is capable of being mounted any position 4 4 STACKING DUAL DRIVES When using the bottom mounting holes of the SA810 860 a second unit may be mounted on top of the first using a mounting kit P N 51592 This method of mounting is not recommended when high shock or vibration levels are expected 4 1 ...

Page 29: ...6 rmm 0 33 0 38 0 03 8 38 mm I 9 7 0 76 mm o f n 9 0 03 I t 2 465 0 05 45 44 0 76 mm 62 61 189 7 I 0 10 mm LED I I 8 55 0 03 1 217 17 mm Q 7 47 0 4 1 27 mm rmm DOOR KNOB I I 1 00 0 04 3 50 0 04 25 4 1 0 mm I 88 9 1 0 mm 12 00 0 02 305 mm 0 5 mm NOTES a Measurements are in inches unless otherwise specified LJ 0 165 NOM 4 19 mm 1 357 0 03 DISK SLOT 34 47 0 76 mm 39216 18 b Faceplate allows 1 8 3 17 ...

Page 30: ...se contaminants will generally be removed by the cartridge self cleaning wiper b Random electrical noise which usually lasts for a few microseconds c Small defects in the written data and or track not detected during the write operation which may cause a soft error during a read The following procedures are recommended to recover from soft errors a Reread the track 10 times or until such a time as...

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Page 32: ...ta pattern shown in figure 6 2 represents a 101 6 1 1 Bit Cell As shown in figure 6 2 the clock bits and data bits if present are interleaved By definition a bit cell is the period between the leading edge of one clock bit and the leading edge of the next clock bit CLOCK BITS DATA BIT IF PRESENT f BIT CELL I 50574 26 FIGURE 6 1 DATA PATTERN CDC D C BIT CELLI IT CE o 1 MSB BINARY REPRESENTATION OF ...

Page 33: ...ency modulation which is the standard method of encoding data on the diskette The differences between FM and MFM encoding are shown in figure 6 5 Note that MFM results in a 1 to 1 relation ship between the flux chan ges per inch and the data bits per inch recorded on the diskette This also results in a doubling of the data transfer rate from 250 to 500 k bytes when compared to FM Data error rate p...

Page 34: ...154 tracks of data The tracks are numbered 0 76 for each side Each track is made available to the read write heads by accessing the head with a stepper motor and carriage assembly and selecting the desired side of the diskette Basic Track Characteristics No Data Bits Track Single Density No Data Bits Track Double Density Index Pulse Width Index Sector Pulse Width Hard Sectored Only 6 4 2 Track For...

Page 35: ...C D fI MFM fI 1F r 1 4 3F 1 50574 30 FIGURE 6 5 FM AND MFM ENCODING 1400 ItS 1__ 200 sr OO _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ I r SYNC 15 BYTES 4 1 WRITE TURN ON DATA CLOCK DATA IDENTIFIER 1 BYTE 15 BYTES 104 130 BYTES NOM 5 2 0 30 ms FIGURE 6 6 SA810 860 HARD SECTOR RECORDING FORMAT FM 6 4 WRITE TURN OFF 50574 31 ...

Page 36: ...dex Pre Address Mark MFM is three bytes of C2 with unique clock bits not written per the encode rules See figure 6 8 Index Address Mark FM is a unique byte to identify the index field and is not written per the encode rules See figure 6 9 Index Address Mark MFM is one byte of FC and is written per the encode rules See figure 6 10 Gl is from index address mark to 10 field address mark sync 10 Field...

Page 37: ...om WG OFF to the next 10 AM sync and allows for the erase core to clear the Data Field CRC bytes speed and write oscillator variation read preamplifier recovery time and system turn around time to read the following ID Field G48 is the last gap prior to physical index and allows for speed and write oscillator variation during a format write and physical index variation D C C D Jl n n n n BIT ELL I...

Page 38: ...BIT CELL 1 BIT CELL 2 BIT CELL 3 BIT CELL 4 BIT CELL 5 BIT CELL 6 BIT CELL 7 BIT CELL 0 IDADDRESSMARKBYTE C BINARY REPRESENTATION OF HEXADECIMAL REPRESENTATION OF DATA BITS o FE CLOCK BITS o o o C7 50574 36 FIGURE 6 11 10 ADDRESS MARK FM D D D D D D D I BIT CELL o BIT ELL IBIT ELL BIT CELL 3 BIT CELL 4 BIT ELL IBIT ELL BIT CELL 7 MFMIDADDRESSMARK BINARY REPRESENTATION OF DATA BITS CLOCK BITS o o o...

Page 39: ...N OF DATA BITS CLOCK BITS BIT CELL 2 BIT CELL 3 BIT CELL 4 BIT CELL 5 BIT CELL 6 DATA ADDRESS MARK BYTE o o o o FIGURE 6 14 DATA ADDRESS MARK FM C C D IT CELL 7 BIT CELL 0 BINARY REPRESENTATION OF DATA BITS CLOCK BITS C 0 BIT CELL 1 D D D C C BIT CELL 2 BIT CELL 3 BIT CELL 4 BIT CELL 5 BIT CELL 6 DELETED DATA ADDRESS MARK BYTE o o o o o o BIT CELL 7 BIT CELL 0 C HEXADECIMAL REPRESENTATION OF FB C7...

Page 40: ... o o o o o o FIGURE 6 16 MFM DATA ADDRESS MARK D D D HEXADECIMAL REPRESENTATION OF FB 00 50574 67 D C BIT ELL IBIT ELL IBIT ELL IBIT iELL IBIT ELL IBIT ELL IBIT ELL IBIT ELL DELETED DATA ADDRESS MARK BINARY REPRESENTATION OF DATA BITS CLOCK BITS o o o o o o o o o HEXADECIMAL REPRESENTATION OF Fa 03 50574 40 FIGURE 6 17 MFM DELETED DATA ADDRESS MARK 6 9 6 10 blank ...

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Page 42: ...a few examples of modifications and how to install them The modifications discussed in the following paragraphs are a External Write Current Switch b Two Sided Status Output SA860 only c Disk Change Option d Side Select Option Using Direction Select SA860 only e Side Select Option Using Drive Select SA860 only f In Use Alternate Input g Motor On Without Selecting Drive h Motor On by Optional Motor...

Page 43: ...OUTPUTS TRUE READY ON PIN 22 X DS1 DRIVE SELECT 1 INPUT PLUGGED DS2 3 4 DRIVE SELECT 2 3 4 INPUT X Y DOOR LOCK ACTIVITY LIGHT ACTIVATED FROM MOTOR ONt PLUGGED z DOOR LOCK ACTIVITY LIGHT ACTIVATED FROM DRIVE SELECTt X PD STEPPER POWER DOWN X WP INHIBIT WRITE WHEN WRITE PROTECTED X NP ALLOW WRITE WHEN WRITE PROTECTED X TS DATA SEPARATION OPTION SELECT X MOTOR ON is the complement of HEAD LOAD on the...

Page 44: ... 4II 1111111I111 1 J C54 RI7 RI5 RI8 RZI Cil CI8 RI CI9 C8 CZ C3 CI AI All A4 LZ c J c J C LI c J S C4 Rll C7 AZ4 RZ5 C5 CAI5 cft C RZ8 c J c J 10 A D Ji LJ c J CSO 1 t RlO t j 0 RSS B CRI7 c FIGURE 7 1 PCB COMPONENT LOCATIONS PIN 25227 AND 25247 7 3 ...

Page 45: ...Rl8 c J iO fI lJ i t RlO t i RS9 B D CRI7 I FIGURE 7 2 PCB COMPONENT LOCATIONS PIN 25249 7 4 ...

Page 46: ...n the drive is selected and the diskette is spinning this line will indicate a logical zero level for two sided media and a logical one for single sided media To install this option on a standard drive jumper trace 25 7 4 DISK CHANGE OPTIONAL OUTPUT This customer installable option is enabled by jumpering trace DC When DRIVE SELECT is activated it will pro vide a true signal logical zero onto the ...

Page 47: ...DE SELECTION USING DRIVE SELECT SA860 ONLY SIDE 0 CT SIDE 1 CT 39216 24 In systems containing no more than two SA860 drives per controller each read write head can be assigned a separate drive address In such cases the four DRIVE SELECT lines can be used to select the four read write heads To implement this option move jumper S2 to S3 and add a jumper to nB n 1 2 3 or 4 For example the first drive...

Page 48: ...horting plug at trace Y to the Z position 7 8 MOTOR ON WITHOUT SELECTING DRIVE This option is useful in disk to disk copy operations It allows the user to keep the motor on for all drives thereby eliminating the motor start time The motor is started on each drive via an Alternate I O pin 18 Each drive may have its own MOTOR ON line Radial or Simplexed or they may share the same line Multiplexed Wh...

Page 49: ...t the output control signals could be monitored without spinning the diskette thereby extending the head and media life When the system requires the drive to perform a read or write the controller would activate the MOTOR ON line pin 18 which in turn would activate the spindle motor After the MOTOR ON line is activated a 165 ms delay must be introduced or the TRUE READY line must be monitored befo...

Page 50: ...OPT MOTOR ON AND DRIVE SELECT CIRCUIT 7 11 RADIAL READY This option enables the user to monitor the READY line of each drive on the interface This can be useful in detec ting when an operator has removed or installed a diskette in any drive Normally the READY line from a drive is only available to the interface when it is selected To install this option on a standard drive the following traces sho...

Page 51: ...L USE As shipped from the factory the write protect feature will internally inhibit writing when a write protected diskette is installed With this option installed a write protected diskette wiWnot inhibit writing but it will be reported to the in terface This option may be useful in identifying special use diskettes To install this option on a drive with the write protect feature the following tr...

Page 52: ... of the jacket is lined with a wiping material to clean the disk of foreign material Figure 8 1 shows the proper method of loading a diskette in the SA810 860 Diskette Storage Drive To load the diskette rotate the door knob clockwise and insert the diskette with the label facing the door knob Rotate the door knob counter clockwise to lock the diskette on the drive spindle The diskette can be loade...

Page 53: ... 2 1 Write Protect Shugart 8 Inch Diskettes The Shugart 8 inch diskettes have the capability of being write protected The write protect feature is selected by the slot in the diskette When the slot is open it is protected when covered writing is allowed The slot is closed by placing a tab over the front of the slot and folding the tab over to cover the rear of the slot The diskette can then be wri...

Page 54: ...ing as shipped to preclude damage in shipping and handl ing Damage to the unit as a result of inadequate packaging will void the warranty on the unit Figure 9 1 shows how to repackage the disk drive using the original shipping containers Figure 9 2 illustrates the pallet pattern and the maximum pallet size to use if reshipped in large quantities 39216 33 FIGURE 9 1 SA81 0 860 PACKAGING 9 1 ...

Page 55: ...42 UNITS PALLET 39216 34 FIGURE 9 2 PALLET LOADING 9 2 ...

Page 56: ...S 220 ms THE MULTIPLEXED MOTOR ON LINE OPTION IS NOT AVAILABLE BUFFERED SEEK IS NOT INCLUDED TRUE READY IS INVALID FOR THE PURPOSE OF MOTOR UP TO SPEED JUMPERS RTR MMO SR MT Y AND Z ARE NOT INCLUDED THE FACEPLATE AND KNOB DESCRIBED IN THE SA810 860 OEM MANUAL 39216 0 IS INCLUDED 1 SAME AS MLC 0 EXCEPT THATTHE FACEPLATE AND KNOB ARE AS DESCRIBED IN THIS MANUAL 2 SAME AS MLC 1 EXCEPT THAT STATIC CLA...

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Page 58: ...rt number for a unique drive configuration AB 68 AB 69 PRODUCT LINE 810 PRODUCT LINE 860 TABLE B 1 SA81 0 860 ORDERING INFORMATION c OPTION D MODEL E OPTION o NONE 810 o NONE c OPTION D MODEL E OPTION o NONE 860 a NONE 8 1 8 2 blank F OPTION o NONE F OPTION o NONE 39224 06 ...

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Page 60: ...lications 475 Oakmead Parkway Sunnyvale Ca 94086 I II II I BUSINESS REPLY CARD First Class Permit NO 1 061 S vale Ca 94086 Postage will be paid by addressee Shugart Attn Technical Publications 475 Oakmead Parkway Sunnyvale Ca 94086 NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES ...

Page 61: ...475 Oakmead Parkway Sunnyvale CA 94086 Is the material presented effectively o Well organized 0 Fully covered 0 Clear o Correct 0 Well illustrated Technical Publications Suggestion Form We would appreciate your comments and suggestions for improving this publication Publicalion No ITille I Dale What is your overall rating of this publication Is the material presented effectively o Very Good 0 Fair...

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