T M 2 5 2 TANDON NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 5.25"/HH Cylinders 306| | | Capacity form/unform 10/ 13 MB Heads 4| | | Seek time / track 85.0/ 3.0 ms Sector/track 17| | | Controller MFM / ST506 Precompensation 128 Cache/Buffer KB Landing Zone 305 Data transfer rate 0.625 MB/S int Bytes/Sector 512 0.625 MB/S ext Recording method MFM operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 4 50 | -40 60 Power: sleep W Humidity % 8 80 | standby W Altitude km -0.457 3.050| -0.457 12.195 idle W Shock g 10 | 40 seek W Rotation RPM 3600 read/write W Acoustic dBA spin-up W ECC Bit MTBF h 11000 Warranty Month Lift/Lock/Park NO Certificates ********************************************************************** J U M P E R S ********************************************************************** TANDON TM252 USER'S MANUAL P/N 179050-001B, 1984 Jumper Setting ============== Drive Address and Option Selection ---------------------------------- The drive address and option selection is determined by the programmable jumper blocks located on the logic circuit board. If jumper configurations are changed, power shoulf be cycled off and on, so that the microprocessor can recognize the new configuration. +------+----------------+------------+-----------------------------+ |Option|Function |Factory | Usage | |Jumper| |Programmed, | | | | |User Access.| | +------+----------------+------------+-----------------------------+ |W15 |Drive Select | I |Omit W15 for drive-to- | | | | |controller lines, enabled | | | | |when drive not selected | +------+----------------+------------+-----------------------------+ |W16 |Index | I |Omit W16 for index-to- | | | | |controller line, enabled when| | | | |drive not selected. | +------+----------------+------------+-----------------------------+ |RTW7 |Read Terminator | I |Install only at the end drive| |WTW8 |Write Terminator| I |for daisy chain data. Install| | | | |in all drives for radial data| +------+----------------+------------+-----------------------------+ |S4W9 |Drive Select 4 | O |Install one of four plugs | |S3W10 |Drive Select 3 | O |only. Plug corresponds to | |S2W11 |Drive Select 2 | O |drive address. | |S1W12 |Drive Select 1 | I | | +------+----------------+------------+-----------------------------+ |U19 |Terminator Pack | I |Install at the end drive only| | | | |for daisy chain control lines| +------+----------------+------------+-----------------------------+ O = Omit I = Install ********************************************************************** I N S T A L L ********************************************************************** TANDON TM252 USER'S MANUAL P/N 179050-001B, 1984 Notes on Installation ===================== Mounting the Drive ------------------ The drive can be mounted in any vertical or horizontal plane. Eight 6-32 tapped holes are provided for mounting: four on each side and four on the bottom of the frame. The drive is manufactured with some critical internal alignments that must be maintained. Hence, it is important the mounting hardware does not introduce significant stress on the drive. Any mounting scheme in which the drive is part of the structural integrity of the enclosure is not permitted. Mounting schemes should allow for adjustable brackets or incorporate resilient members to accommodate tolerances. Tapped Mounting Holes --------------------- Four on Bottom, four on each side 6-32 UNC x .31 in. (7.9mm) deep, 8 places. Daisy Chain Capability ---------------------- The drive provides the address selection and gating functions necessary to daisy chain a maximum of four units at the user's option. The last drive on the daisy chain terminates the interface. The terminations are accomplished by a resistor array plugged into a DIP socket. Industry Standard Interface Compatibility ----------------------------------------- The drive is compatible with controllers that use an ST506 industry standard interface. Dust Cover ---------- The design of an enclosure should incorporate a means to prevent contamination from loose items, e.g., dust lint, and paper chad since the drive does not have a dust cover. Free Air Flow ------------- When the drive is mounted so the components have access to the free flow air, normal convection cooling allows operation over the specified temperature range. Confined Environment -------------------- When the drive is mounted in a confined environment, air flow must be provided to maintain specified air temperatures in the vicinity of the motors and the circuit boards. Interface Connectors -------------------- The electrical interface between the drive and the host system is via three connectors. J1 provides control signals for the drive. J2 provides for the radial connection of read/write data signals. J3 provides for DC power. J1/P1 Connector --------------- Connection to J1 is through a thirty-four-pin circuit board connector. The pins are numbered 1 through 34. The recommended mating connector for P1 is 3M ribbon connector P/N 3463-0001, without ears. A key slot is provided between Pins 4 and 6. J2/P2 Connector --------------- Connection to J2 is through a 20-pin circuit board connector. The recommended mating connector for P2 is 3M ribbon connector P/N 3461-0001, without ears. A key slot is provided between Pins 4 and 6. J3/P3 Connector --------------- DC power connector J3 is a four-pin AMP Mate-N-Lok connector, P/N 350211-1, mounted on the component sode of the circuit board. The recommended mating connector, P3, is AMP P/N 1-480424-0, utilizing AMP pins P/N 60619-4. J3 pins are labeled on the J3 connector. J3 cabling must be 18 AWG, minimum. +-----J3-----+ pin 1 +12 VDC | 4 3 2 1 | pin 2 +12 Volts Return +------------+ pin 3 + 5 Volts Return pin 4 + 5 VDC Ground Connector ---------------- A ground connector, located on the rear of the head/disk assembly is Faston AMP P/N 61761-2. The recommended mating connector is AMP P/N 62187-1. To realize error rates, it must be connected directly to the centrally located system logic ground via an 18 AWG, minimum, cable. ********************************************************************** F E A T U R E S ********************************************************************** TANDON TM252 USER'S MANUAL P/N 179050-001B, 1984 General Description ------------------- Tandon Corporation's TM252 drive is a full feature, 12.75 megabyte, one-half height, 5-1/4-inch, rigid disk drive. It is a compact data storage device containing two 130-millimeter plated aluminium recording platters and four recording heads within a sealed housing. Purpose of the drive -------------------- The 5-1/4-inch disk drive is a rotating disk memory device designed for random access data storage and retrieval. Typical applications include word processing systems, entry level microprocessor systems, intelligent calculators, program storage, small business computer systems, and any application in which low cost, random access data storage is required. Microprocessor Control ---------------------- The TM252 drive features an onboard microprocessor, providing five major functions: 1. Self-calibration on power-up. 2. Buffered seek timing for improved access times. 3. Improved positioning with reduced hysteresis. 4. Write current switching for optimal recording quality. 5. Power and track fault detection. Air Filtration -------------- A self-contained, recirculating air filtration system supplies clean air through a 0.3-micron filter. A secondary absolute filter is provided to allow pressure equalization with the ambient atmosphere without contamination. The entire head-disk-actuator compartment is maintained at a slightly positive pressure to further ensure an ultraclean environment. Functional Description ---------------------- The drive is fully self-contained, and requires no operator inter- vention during normal operation. During the power-up sequence, the spindle motor reaches 3,600 RPM, and the positioning mechanism recalibrates the recording heads to Track 0. At this time, a Ready signal on the interface indicates the drive is ready for operation. The head is positioned over the desired track by means of a four- phase stepper motor/band assembly and its associated electronics. This positioner uses a one-step rotation to cause a one-track radial movement. Subsequently, the recording heads can be positioned over the desired cylinders, and the data can be read or written from the appropriate track by selecting the desired head. Typically, the drive uses MFM write and read data recording methods. Data recovery electronics include a low-level read amplifier, differentiator, a zero-crossover detector, and digitizing circuits. No data encoding or decoding feature is provided on the drive. The drive has the following sensor systems: 1. An optical Track 0 switch senses when the Head/Carriage Assembly is positioned at Track 0. 2. An index sensor, which consits of a magnetic pick-up and index hole positioned an analog signal when an index hole is detected. Seek Time --------- +----------------------------------+--------+ | | TM252 | +----------------------------------+--------+ |Track-to-Track msec. typ. | 3 | +----------------------------------+--------+ |Average msec. typ. | 85 | | msec. max. | 321 | +----------------------------------+--------+ |Latency msec. avg. | 8.33 | +----------------------------------+--------+ Media Defects ------------- Any defects on the media surface will be identified on a defect map provided with each drive. This defect map will indicate the head number, track number, and number of bytes from index for each defect. Each defect shall be no longer than 16 bits. More than one defect per track is to be counted as one defect. Cylinders 000 and 001 are guranteed error free.