1450XLD disk drive, Dokumenty atarowskie, Komputery 8-bitowe, Atari 1450XLD

W W OOO RRRR DDDD 1 1W W O O R R D D 11 11W W O O R R D D 1 1 1 1W W W O O RRRR D D ----- 1 1W W W O O R R D D 1 1WW WW O O R R D D 1 1W W OOO R R DDDD 11111 11111U U SSS EEEEE RRRR DDDD OOO CCCU U S S E R R D D O O C CU U S E R R D D O O CU U SSS EEEE RRRR D D O O CU U S E R R D D O O CU U S S E R R D D O O C CUUU SSS EEEEE R R DDDD OOO CCC3333 000 000 / 1 1 000 1 13 0 0 0 0 / 11 11 0 0 11 113 0 00 0 00 / 1 1 1 1 0 00 1 1 1 13 0 0 0 0 0 0 / 1 1 0 0 0 1 13 00 0 00 0 / 1 1 00 0 1 13 0 0 0 0 / 1 1 0 0 1 13333 000 000 / 11111 11111 000 11111 11111WPSSPL Version 2.8.5 Spooling device DRB1:June 19, 1984 02:25 PMAtari, Inc.Printing document:(11) INTEGRAL DISK DRIVE SPEC prelimCopies: 1Delete after printing: NoTable driven file: DRA0:[376,10]WPSLP.DEFATARI 1450XLHOME COMPUTERINTEGRALDISK DRIVESPECIFICATION======NOTICE======TO ALL PERSONS RECEIVING THIS DOCUMENT------------------------Confidential Information------------------------------------------------------------------------------------------Reproduction of this document is forbidden without the specificwritten permission of ATARI, INC., Sunnyvale, CA 94086. No rightto reproduce this document, or the subject matter thereof, isgranted unless by written agreement with, or written permissionfrom the Corporation.------------------------------------------------------------------C062063 - PreliminaryINTEGRAL DISK DRIVE Specification - PreliminaryT_A_B_L_E_ O_F_ C_O_N_T_E_N_T_S_1.0.0.0 INTRODUCTION2.0.0.0 RELEVANT DOCUMENTS3.0.0.0 OVERVIEW4.0.0.0 PERFORMANCE5.0.0.0 INTERFACE SPECIFICATIONS6.0.0.0 SOFTWARE EXTERNAL REFERENCE SPECIFICATIONF_I_G_U_R_E_S_:5.01 - ATARI 1450XL Home Computer (3/4 view)5.02 - Integral Disk Drive Mechanical DetailsC062063 - PreliminaryINTEGRAL DISK DRIVE Specification - Preliminary1.0.0.0 I_N_T_R_O_D_U_C_T_I_O_N_This document details the engineering design specificationsfor the integral Disk Drive of the ATARI 1450XL Home Compu-ter. It is the major information transfer document for thetransfer of information from the Hardware and Software Devel-opment groups to Manufacturing, Design Assurance, and Appli-cations Software organizations. It covers all aspects of theDisk Drive either directly or indirectly by reference to ap-plicable documents.2.0.0.0 R_E_L_E_V_A_N_T_ D_O_C_U_M_E_N_T_S_ATARI 600XL Home Computer Product Specification - C061611ATARI Single Density Floppy Diskette Specification - C016884ATARI Double Density Floppy Diskette Specification - C016890ATARI 1050 Disk Drive Specification - C061272ATARI Personal Computer System, Operating System User'sManualTandon TM50-2 Product Specification and User's ManualParallel Bus Interface (PBI) Specification - C061902ATARI SIO Specification - 81-PS-06023.0.0.0 O_V_E_R_V_I_E_W_The ATARI 1450XL Home Computer Integral Disk Drive shall be arotating disk memory designed for random access data entry,storage, and retrieval applications. Typical applicationsinclude storing programs and data, and loading programs intothe system.The drive shall be capable of reading both sides of a disk-ette in single density or double density formats, at theuser's discretion.C062063 - Page 1INTEGRAL DISK DRIVE Specification - Preliminary4.0.0.0 P_E_R_F_O_R_M_A_N_C_E_4.1.0.0 E_n_v_i_r_o_n_m_e_n_t_a_l_4.1.1.0 TemperatureOperating (media dependent) -- 10 degrees C to 46degrees C (50 degrees F to 115 degrees F)Non operating -- -40 degrees C to 71 degrees C (-40degrees F to 160 degrees4.1.2.0 Relative HumidityOperating, noncondensing (media dependent) -- 20 to80 percentNonoperating, noncondensing -- 5 to 85 percent4.1.3.0 Altitude152.4-meters (500-feet) below sea level to15,240-meters (50,000-feet) above sea level.4.2.0.0 E_n_d_u_r_a_n_c_e_ L_e_v_e_l_s_The Integral Disk Drive shall use ANSI compatible 5-1/4inch diskettes with a media life (for reference only) of4x10^6 passes per track. The drive shall format disk-ettes with 40 tracks, single density, and 80 tracks,double density. There shall be a track spacing of0.529-millimeters (20.8 milinches).The drive head life shall be 20,000 media contact hours.The disk rotational speed shall be 288 RPM (plus orminus 1.5 percent). There shall be an average rotationallatency of 104 milliseconds, with an instantaneous speedvariation (ISV) of plus or minus 3-percent.The motor start time shall be 1-second, maximum.The seek time, track to track, shall be 20 milliseconds.The head settling time shall be 20 milliseconds, with anaverage track access time (including head settling time)of 287-milliseconds <?>.The recording mode is FM (Single Density) and MFM(double density).The data transfer rate shall be 250,000 bits per second,double density.Flux reversals per inch (FRPI) on the inside track shallbe 5,535 for side 0 and 5,877 for side 1.C062063 - Page 2INTEGRAL DISK DRIVE Specification - PreliminaryThe unformatted recording capacity shall be 520,800bytes per diskette.4.3.0.0 R_e_l_i_a_b_i_l_i_t_y_4.3.1.0 Error RatesExclusive of external sources, such as electronicequipment, and defective or contaminated diskettes.Recoverable soft errors -- 1/10^9 bitsRecoverable hard errors -- 1/10^12 bitsSeek Errors -- 1/10^6 seeks4.3.2.0 MTBF and MTTRMTBF -- 8,000 hours, 25 percent duty cycleMTTR -- 30 minutes(These are Tandon's figures)4.4.0.0 C_o_m_p_l_i_a_n_c_e_s_UL for power????UL for fan????4.5.0.0 E_l_e_c_t_r_i_c_a_l_ P_e_r_f_o_r_m_a_n_c_e_+12-volts DC plus or minus 0.6-volt, 1.3 amperes,maximum, surge for 50 mulliseconds, 800 milliampsaverage.+5 volts DC plus or minus 0.25 volt at 800milliamps, maximum, with less than 100 millivoltspeak-to-peak ripple.C062063 - Page 3INTEGRAL DISK DRIVE Specification - Preliminary5.0.0.0 I_N_T_E_R_F_A_C_E_ S_P_E_C_I_F_I_C_A_T_I_O_N_S_5.1.0.0 P_a_c_k_a_g_e_ a_n_d_ A_p_p_e_a_r_a_n_c_e_The ATARI 1450XL Home Computer Integral Disk Drive willbe a low profile that will be installed at the top rightof the computer console (see Figure 5.01). An activityindicator <LED?>, located on the front panel is to beautomatically illuminated when the drive is selected.User access for diskette loading will be via an horizon-tal slot at the front of the drive. The diskette will belocked into place by a front latch.5.2.0.0 E_l_e_c_t_r_o_m_e_c_h_a_n_i_c_a_l_ S_u_b_a_s_s_e_m_b_l_i_e_s_5.2.1.0 Functional DescriptionWhen the user inserts a diskette into the drive, itwill be held in place by aluminum guard rails. Thediskette will slide into the drive until a backstop is encountered, which will latch the ejectionmechanism.Closing the front latch will activate the coneclamping mechanism, which will accurately centerthe diskette and clamp it into place. The drive hubis held to a constant rotation of 288-RPM by aservo-controlled DC motor. The heads will remain incontact with the diskette until the front latch isopened.The drive heads will be positioned over the desiredtrack by means of a 4-phase stepper motor-bandassembly and associated electronics. The positionerwill use a one step rotation to cause a one tracklinear movement.When the front latch is opened, the cone clampingmechanism will raise, allowing for the free exit ofthe diskette. The eject mechanism will then unlatchand force the diskette part way out of the drive.5.2.2.0 Mechanical DetailsRefer to Figure 5.02.The drive will have a Track 0 sensor, which willdetect when the Head-Carriage Assembly is posi-tioned Track 0 on the diskette. It will also have awrite protect sensor which will disable the writeelectronics when a tab covers the write protectnotch on the diskette.C062063 - Page 4INTEGRAL DISK DRIVE Specification - PreliminaryThe drive spindle will be belt driven by a DC motorwhich will contain an integral tachometer. Theservo control circuit and tachometer will controlthe speed of the spindle.The Read/Write Head Assembly will be positioned bya split band positioner mounted to a stepper motor.The read/write heads will be glass bonded ferriteceramic structures and have a life expectancy of20,000 operating hours.The electronic components will be mounted on twoprinted circuit boards. The logic circuit board isto be mounted above the chassis. The motor controlcircuit board is to be mounted on the bottom of thechassis.5.2.3.0 Power and Interface SignalsPower and the interface signals are to be routedthrough two 23-pin connectors which will plug di-rectly into the CPU board. The connectors will matedirectly with the circuit board connectors at therear of the drive.The first connector is for Drive 1; the second isfor Drive 2. The pin assignments are as follows:1-4 Write Protect5-7 Diskette Enable8-11 Track 0 Sensor12-17 Stepper Motor Control18-21 Spindle Motor Control22-23 Disk Activity Light5.2.4.0 Cooling FanA ??-inch cooling fan shall be placed on the rearof the disk drive. It shall draw +12-volts, 0.15-afrom <?????>....

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