Tandon TM848 Specification and Schematic

REVISIONS

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DESCRIPTION

Release

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PRODUCT SPECIFICATIONS

MODEL NUMBERS TM848·1 AND TM848-2

EIGHT-INCH FLEXIBLE DISK DRIVES, 48 TPI

SIGNATURES

DR. O'BRIENCHI(

DATE

3/24 'anaonCORPORATION

~ TITLE1-1NQl--------+---f PRODUCT SPECIFICATIONS

"01. INQl MUNRO 3/25 MODEL NUMBERS TM848: AND -2t-----....;.;...;...;...;..;..:..;~--t EIGHT-INCH FLEXIBLE

DISK DRIVES, 48 TPI

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1. INTRODUCTION

Tandon Corporation's Model TM848-1 and Model TM848-2 eight-inch flexible disk drives are full-feature drivesthat may be installed in only one-half the space normally required for an eight-inch disk drive. They are compactdata storage devices that use an IBM - formatted Industry Standard eight-inch diskette.

The Model TM848·1 flexible disk drive is capable of reading and writing in single density format on a diskette,using a proprietary read/write head developed and patented by the Tandon Corporation. This disk drive has adouble density capability when a Modified Frequency Modulated (MFM) or other appropriate recording techniqueis used. The encoding and decoding of the data is done by the user's Controller. The Model TM848-2 flexible diskdrive doubles data storage capabilities by utilizing both sides of the diskette.

Track positioning is accomplished by utilizing a metal band driven by a high-speed stepper motor that provides athree (3) millisecond track-to-track step interval.

The use of a DC spindle motor, which may be optionally controlled by the host system, reduces power consumptionand heat dissipation within the disk drive.

1.1 SCOPE OF THE DOCUMENT

This product specification contains the major features, performance specifications, reliability, environmentalspecifications, mechanical specifications and mounting power requirements, interface description, and typicalelectrical interface and timing characteristics of Model TM848-1 and TM848-2 eight-inch flexible disk drives.The TM848-1 disk drive is a forty-eight (48) tracks per inch, single-sided recording device. The TM848-2 diskdrive has the same number of tracks per inch, and is a double-sided recording.

2. MAJOR FEATURES

2.1 WRITE PROTECT (STANDARD)

When a Write Protected diskette is inserted into the flexible disk drive, the write electronics are disabled.

2.2 DAISY CHAIN CAPABILITY (STANDARD)

The disk drive provides Address Selection and Gating functions necessary to daisy chain a maximum of four (4)disk drives at the user's option. The last disk drive on the daisy chain terminates the interface. The terminationsare accomplished by a resistor array plugged into a DIP socket.

2.3 INTERNAL TRIM ERASE (STANDARD)

The flexible disk drive provides the necessary control signals internally for proper trim erasure of data.

The reduced size of the disk drive enables it to occupy only one-half the mounting space required for aconventional drive.

COMPACT SIZE2.4j

II

IIII

I 2.5 DISKETTE LEVER LOCK (OPTIONAL) I'

I The diskette lever lock is controlled by the host system.I~--------~----r-------------"""-'--...----r----:-!, a PRODUCT SPECIFICATIONS . !

a n D' n MODEL NUMBERS TM848-1 AND TM848~2 Rev.: X2 , of 14 I. " EIGHT-INCHFLEXfBLE DISK DRIVES !

2.6

2.7

2.8

3.

3.1

3.2

3.3

3.4

3.5

3.6

INDUSTRY STANDARD INTERFACE COMPATIBILITY

The disk drive is compatible with Industry Standard Controllers.

STRAPPABLE OPTIONS

Industry Standard strappable options are available (see Section 10).

ACTIVITY INDICATOR (STANDARD)

An activity indicator, located on the front panel, is automatically illuminated when the flexible disk drive is·selected.

PERFORMANCE SPECIFICATIONS

HEAD WEAR GUARANTEE

Head Wear Guarantee: 15,000 media contact hours

MEDIA AND MEDIA WEAR GUARANTEE

Media: 203.20 mm (8.0 inSh) Industry Standard DisketteWear Guarantee: 3.0 X 10 passes per track, minimum

TRACKS

Number Of Tracks: 77 for TM848-1154 for TM848-2, 77 per surface

Spacing: .529 mm (20.8 milinches)

Inside Track Radius:51.50 mm (2.03 inches), Side 0, both models49.42 mm (1.95 inches), Side 1, TM848-2 only

ACCESS TIMES

Track-To-Track: 3 millisecondsHead Settling Time: 15 millisecondsAverage Access Time, including head settling time: 91 milliseconds

DISK ROTATIONAL SPEED

Motor Start Time: 0.7 second, maximumAverage Latency, including seek and disk travel: 83 millisecondsDisk Rotational Speed: 360 RPMInstantaneous Speed Variation (ISV).: .± 1.25%

RECORDING CAPACITY AND METHOD

Flux Changes Per Inch, Inside Track:6536 FCI, Side 0, both models6816 FCI, Side 1, TM848-2 only

Transfer Rate:250K Bits per second, single density500K Bits per second, double density

'anaanPRODUCT SPECIFICATIONSMODEL NUMBERS TM848-1 AND TM848-2EIGHT-INCH FLEXIBLE DISK DRIVES

Rev. X2 .of 14

3.7

4.

4.1

4.2

4.3

4.4

4.5

5.

Unformatted Recording Capacity:0.8 MBytes per disk, single density1.6 MBytes per disk, double density

IBM Format Recording Capacity:0.6 MBytes, single density1.2 MBytes, double density

Recording Method:FM, Single DensityMFM, Double Density

ELECTROMAGNETIC CHARACTERISTICS

Tandon Corporation's Model TM848-1 and Model TM848-2 eight-inch flexible disk drives are designed tominimize electrical interference generated internally, propagated through space or on associated conductors.

RELIABILITY

ERROR RATES

Soft Read Errors: 1 in 109 bitsHard Read Errors: 1 in 1012 bitsSeek Errors: 1 in 106

MEAN TIME BEFORE FAILURE

MTBF:10,000 power-on hours

MEAN TIME TO REPAIR

MTTR: 30 minutes

PERIODIC MAINTENANCE

Typical Periodic Maintenance: Every 10,000 power-on hours (see Maintenance Schedule, OEM manual).

COMPONENT LI FE

Average Component Life: 15,000 power-on hours

ENVIRONMENTAL SPECIFICATIONS

The disk drive has been designed to meet its operational specifications under the environmental conditions listedon the next page.

'anaon PRODUCT SPECIFICATIONS MODEL NUMBERS TM848·1 AND TM848-2 Rev. X2

of 14EIGHT- INCH FLEXIBLE DISK DRIVES

lJ

5.1

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TEMPERATURE

I

Ii

IIII

5.2

5.3

Operating Temperature: 440 C to 460 C (400 F to 1150 F)Storage Temperature: -400 C tot1 0 C (-400 F to 1600 F)Wet Bulb Temperature: 260 C (780 F) maximum

RELATIVE HUMIDITY

Operating (Noncondensing): 20% ,-- 80%

ALTITUDE

Operating or nonoperating, altitude: From 304.8 meters (1000 feet) below sea level to 15,240 meters (50,000 feet)above sea level.

5.4 SHIPMENT

When prepared for shipment by Tandon Corporation, the eight-inch flexible disk drive will meet the requirementsof NSTA Pre-Shipment Test Procedure Project 1A.

6.

6.1

6.2

7.

7.1

MECHANICAL SPECIFICATIONS AND MOUNTING .

MECHANICAL SPECI FICATIONS

The physical dimensions of Model TM848-1 and Model TM848-2 eight-inch, flexible disk drives are:Height: 58 mm (2.30 inches)Width: 217 mill (8.55 inch_f!s)Length: 337mm (13.25 inches)Weight: 15.4 kg (7 pounds)

MOUNTING

The eight-inch, flexible disk drive may be mounted horizontally or vertically. When mounted horizontally, thecircuit board must be on top.Four 8-32nd tapped mounting holes are provided on the bottom of the disk drive, as are two 8-32nd tappedmounting holes on each side of the disk drive, for attachments to user-supplied mounting brackets (see Figure 1).While four mounting holes are provided for convenience, a three-hole mounting scheme is recommended.

Two drives may be mounted in a single, full-size drive enclosure (4.6" high), using optional mounting brackets.

..._.._........• ---, --

POWER REQUIREMENTS

DC POWER SEQUENCING

A maximum of 0.7 second is required from the time power is applied to the disk drive until a command can beaccepted.

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'anaonPRODUCT SPECIFICATIONSMODEL NUMBERS TM848-1 AND TM848-2EIGHT- INCH FLEXIBLE DISK DRIVES

Rev.X2of 14

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TABLE 1

DC Power Connector Pin Assignment

PIN NUMBER DESCR IPTION

123

+24V dc+24V Return+5V Return

4 No connection5 +5V dc6 +5V Return

II

PRODUCT SPECIFICATIONS.

'anaon MODEL NUMBERS TM848-1 AND TM848-2 Rev.: X2

EIGHT- INCH FLEXIBLE DISK DRIVES of 14

7.2

7.3

8.

8.1

PRIMARY POWER

Standard Operation:Voltage: +24V dc ±.10%Selected Motor On: 1.2 amps typicalDeselecrect:---o:l--amp-- --typiCa1Spindle Motor: 0.5 amps typical

Voltage: +5V dc ±.5%Selected Motor On: 1.0 amp typical

DC POWER CONNECTOR

DC power is supplied to the eight-inch, flexible disk drive through a six-pin AMP connector, Part Number 1-480271-0,connected to the circuit board. The mating connector, AMP Part Number1-480270-0, utilizes AMP contactPart Number 60619-1. Pin assignments are found in Table 1.

The chassis should be connected to earth ground to ensure proper operation.

INTERFACE DESCRIPTION

The I/O is an industry-compatible interface. The connector is a 50-pin edge card connector.

All output lines are TTL compatible open collector, which are terminated in the host system. Input lines utilizeSchmitt trigger type inverters terminated with 150 ohms to +5V dc

Table 2 shows all drive interface lines and pin connections. Maximum cable length is three meters (ten feet) ofribbon or twisted pair. cable.

Figure 3 shows interface timing relationships for the signals discussed below (see Section 9).

INPUT (CONTROLLER-TO-DISK DRIVE) LINES

There are twelve (12) input lines, eleven (11) of which are standard and one (1) of which is a strappable feature.

There are two kinds of input signals: those multiplexed in a multiple drive system and those which are not.

The input signals not multiplexed include:

1. Motor Off Control

2. Drive Select 1

3. Drive Select 2

4. Drive Select 3

5. Drive Select 4

'anaonPRODUCT SPECIFICATIONSMODEL NUMBERS TM848-1 AND TM848-2EIGHT-INCH FLEXIBLE DISK DRIVES

Rev. X2of 14

TABLE 2

DRIVE INTERFACE LINES AND PIN CONNECTIONS

GROUND PIN NUMBER SIGNAL

2 Write Current Switch

3 4 Alternate Input/Output (I/O)

5 6 Motor Off Control

7 8 Alternate I/O

9 10 Two Sided (Strappable) (Model TM8484-2 only) I

I11 12 Disk Change (Strappable)

13 14 Side Select (Model TM848-2 only) I15 16 Activity Indicator (Str~ppable) l ,

17 18 Not used

19 20 Index

21 22 Ready

23 24 Alternate I/O

25 26 Drive Sel.ect 1 (Side Select Option, TM848-2 only)

27 28 Drive Select 2 (Side Select Option, TM848-2 only)

29 30 Drive Select 3 (Side Select Option, TM848-2 only)I

i31 32 Dtive Select 4 (Side Select Option, TM848-2 only)

II

I 33 34 Direction Select (Side Select Option, TM848-2 only)

I.35 36 Step I

I

37 38 Write Data I

39 40 Write Gate

41 42 Track 00

43 44 Write Protect

45 46 Read Data

47 48 Alternate I/O

49 50 Alternate I/O

II

'anaanPRODUCT SPECIFICATIONS MODEL NUMBERS TM848-1 AND TM848-2 Rev.:X2EIGHT-INCH FLEXIBLE DISK DRIVES of 14

The input signals to be multiplexed include:

1. Step

2. Direction Select

3. Write Gate

4. Write Data

5. Activity Indicator (Strappable)

6. Write Current Switch

7. Side Select (Model TM848·2 only)

8.1.1 MOTOR OFF CONTROL

The motor control lead is used to turn off the spindle motor. When the signal line logic level goes true (low), thedrive's spindle stops. When the Motor Off Control logic level goes false (high), the drive's spindle accelerates to aspeed of 360 RPM, and stabilizes at this speed within a maximum of 0.7 of a second.

8.1.2 DRIVE SELECT

When activated to a true (low) level, Drive Select activates the disk drive electronics, loads the Read/Write head,and readies the drive to respond to Step. Read or Write commands. Four separate input lines - . Drive Select 1,Drive Select 2, Drive Select 3, and Drive Select 4 - - are provided so up to four disk drives can be multiplexedin a system. The address of each disk drive is determined by a select shunt on the signal circuit board.

NOTES

The Drive Select line must remain stable at the logical true (low) level until.a Step, Read, or Write command iscompleted.

Only one Drive Select line can be at a logical true (low) level at a time.

8.1.3 STEP

The Step interface signal causes the Read/Write head assembly to move in the direction of motion defined by theDirection Select line. After the disk drive is selected, a true (low) pulse initiates the access motion on the trailingedge of the Step pulse.

NOTE

The time period between consecutive trailing edges of Step pulses should be no less than three (3) milliseconds.

8.1.4 DIRECTION SELECT

I The Direction Select interface signal determines the direction of motion of the Read/Write head assembly whenI . the Step line is pulsed. The ReadlWrite head assembly moves toward the center of the disk when the Direction

I a PRODUCT SPECIFICATIONSI 'an· D n MODEL NUMBERS TM848-1 AND TM848-2 Rev.:X2I . EIGHT-INCH FLEXIBLE DISK DRIVES

of 14

,----------------------------------------------------_.-"-

Select line is at the logical true (low) level and a Step pulse is issued. Conversely, the Read/Write head assemblymoves away from the center of the disk when the Direction Select line is at the logical false (high) level and aStep pulse is issued.

NOTE

To ensure correct positioning, the Direction Select line should be stable one (1) mircosecond prior to the trailingedge of the Step pulse. It should remain stable for one (1) mircosecond after the Step pulse.

The drive electronics ignore Step pulses when one of the conditions listed below exists:

1. The Write Gate signal is true (low).

2. The disk drive is not selected.

8.1.5 WRITE GATE

When this signal is in a true (low) state, the write electronics are enabled for writing data on the diskette. The readelectronics are disabled. The Write Gate signal turns on write current in the Read/Write head assembly. Data iswritten under the control of the Write Data input line and the Side Select input line. When the Write Gate line islogical one, the write electronics are disabled.

NOTES

Changes of state of the Write Gate line should occur before the first Write Data pulse.

When a write-protected diskette is installed, the write electronics are disabled.

8.1.6 WRITE DATA

The Write Data interface line is enabled by Write Gate being active. The Write Data line provides the data to bewritten on the diskette. Each transition from a logical one to a logical zero level causes the current passing throughthe Read / Write head assembly to be reversed, resulting in a data bit being written on the diskette.

8.1.7 ACTIVITY INDICATOR

This strappable feature illuminates the Activity Indicator when activated to a logical zero level.

8.1.8 WRITE CURRENT SWITCH

A logical zero (low) signal initiates the lower value of Write Current for writing on Tracks 43 through 76. Conversely,a logical one (high) signal allows use of a higher value of write current for Tracks°through 42.

8.1.9 SIDE SELECT

The side Select interface line is available only on Tandon's Model TM848-2. It defines which side of a two-sideddiskette is to be used for reading or writing. An open circuit or logical one selects the Read/Write head on theSide 0 surface of the diskette. A true (low) selects the Read/Write head on the Side 1 surface of the diskette. When I

I Sw_it_c_h_in_g_f_ro_m_o_n_e_he_a_d,...t_o_t_h_e_o_t_h_e_r,_a_lo_o_m_i_c_ro_s_e_co_n_d_d_e_la_y_i_S_re_q_u_i_re_d_b_e_f_o_re_a_nY_r_ea_d_o,...r_w_r_it_e_o_p_e_ra_t_io_n-r-ca_n ~_ be initiated.

lPRODUCT SPECIFICATIONS, a n a D n MODEL NUMBERS TM848·1 AND TM848·2 Rev.: X2 I

. EIGHT-INCH FLEXIBLE DISK DRIVES of 14

8.2 OUTPUT (DISK DRIVE-TO-CONTROLLER) LINES

There are seven (7) output lines, five (5) of which are standard and two (2) of which are strappable features.

The standard output signals are:

1. Read Data

2. Track 00

3. Write Protect

4. Index

5. Ready

The strappable output signals are Disk Change and Two Sided, the latter of which is available only on ModelTM848-2.

8.2.1 READ DATA

The Rea-d Data line transmits data to the Controller when the disk drive is selected and not writing. It provides apUlse for each flux transition recorded and detected on the diskette by the drive electronics. Normally, this signalis a logical one level (high); it becomes a Ipgical zero level (low) for the active state. The Read Data output linegoes to a logical zero level (low) for a duration of 200 nanoseconds, ±50 nanoseconds, for each flux changerecorded on the diskette.

8.2.2 TRACK 00

When the disk drive is selected, the Track 00 interface signal indicates. to the Controller that the Read/Write headis positioned at Track 00, the outermost track. This signal remains at a logical zero level (low) until the Read/Writehead assembly is moved away from Track 00. This signal is at a logical one level (high) when the selected diskdrive's ReadlWrite head assembly is not at Track 00.

8.2.3 WRITE PROTECT

The Write Protect signal is provided to indicate to the user a Write Protected diskette is installed. This signal is alogical zero level when the diskette's write protect notch is not covered.

When the Write Protect signal is a logical one level, the write electronics are enabled and write operations can beperformed.

NOTE

Removing the WP strap and installing the NP strap allows the disk drive to write on the disk when the disk is writeprotected. Write Protect status only indicates the write protect status of the diskette, not the configuration of theWP - NP straps.

8.2.4 INDEX

The Index signal pulse is provided once each revolution of the diskette to indicate the logical beginning of a trackto the Controller.

'anaanPRODUCT SPECIFICATIONSMODEL NUMBERS TM848-1 AND TM848-2EIGHT-INCH FLEXIBLE DISK DRIVES

Rev.: X2 lof 14

8.2.5 READY

The Ready interface signal indicates that the diskette is rotating at 360 RPM and two (2) index holes have beensensed after a diskette was inserted into the disk drive.

When a single-sided diskette is installed, Ready is active (low) if Side 0 is selected. Ready is false (high) if Side 1is selected on TM848-2. When a two-sided diskette is installed, Ready is active when either side of the diskette isselected on the TM848-2.

8.2.6 DISK CHANGE

This strappable feature provides a true How) signal to the interface when Drive Select is activated if the disk drivehas gone from a Ready to a Not Ready condition while deselected. This line is reset on the true-to-false transitionof Drive Select if this disk drive ~as gone to a Ready condition.

8.2.7 TWO SIDED

This option is available only on Tandon's Model TM848-2. This strappable feature indicates that a two-sideddiskette is installed.

9. TYPICAL ELECTRICAL INTERFACE AND TIMING CHARACTERISTICS

Lines between the Controiler and the disk drive have the following characteristics:

True = Vout +0.4V (MAX) @ lout = 48mA(maximum)

False =Vout +2.4V (MIN) (Open collector @ lout =250 uA) (maximum)

Figure 2 contains the electrical interface characteristics. Figure 3 contains the general control and data timingrequirements for Model TM848-1 and TM848-2.

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L'anaonFIGURE 2

ELECTRICAL INTERFACE CHARACTERISTICS

PRODUCT SPECIFICATIONSMODEL NUMBER TM848-1 AND TM848-2EIGHT-INCH FLEXIBLE DISK DRIVES

Rev.:X2of 14

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FIGURE 3

GENERAL CONTROL AND DATA TIMING REQUIREMENTS

PRODUCT SPECIFICATIONSMODEL NUMBERS TM848·1 AND TM848·2FLEXIBLE DISK DRIVES

Rev.: X2of 14

10. STRAPPABLE OPTIONS

Table 3 contains a list of user-selectable strappable options for Model TM848-1 and TM848-2.

TABLE 3

USER-SELECTABLE STRAPPABLE OPTIONS

TRACE FROM FACTORYDESIGNATOR DESCR IPTION OPEN SHORT

DS1 - DS4 Drive address select pins DS1Z In use from Drive Select XR Ready alternate output pad

IX

I Index alternate output pad XD Alternate input in use XDC Alternate output disk change X25 Alternate output disk two-sided* X

OS Stepper power from Drive Select XOL Diskette Lever (Optional) XRR Radial Ready XRI Radial Index XW.P Inhibit write when Write Protected X1B-4B Side Select option using Drive Select * XS1 - S3 Head Select option S1,S3 52

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*For Model TM 848-2 only

II

'anaanPRODUCT SPECI FICATIONSMODEL NUMBERS TM848-1 AND TM848-2 Rev.:X2

EIGHT - INCH FLEXIBLE DISK DRIVES of 14

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