W W OOO RRRR DDDD 1 1 W W O O R R D D 11 11 W W O O R R D D 1 1 1 1 W W W O O RRRR D D ----- 1 1 W W W O O R R D D 1 1 WW WW O O R R D D 1 1 W W OOO R R DDDD 11111 11111 U U SSS EEEEE RRRR DDDD OOO CCC U U S S E R R D D O O C C U U S E R R D D O O C U U SSS EEEE RRRR D D O O C U U S E R R D D O O C U U S S E R R D D O O C C UUU SSS EEEEE R R DDDD OOO CCC 3333 000 000 / 1 1 000 1 1 3 0 0 0 0 / 11 11 0 0 11 11 3 0 00 0 00 / 1 1 1 1 0 00 1 1 1 1 3 0 0 0 0 0 0 / 1 1 0 0 0 1 1 3 00 0 00 0 / 1 1 00 0 1 1 3 0 0 0 0 / 1 1 0 0 1 1 3333 000 000 / 11111 11111 000 11111 11111 WPSSPL Version 2.8.5 Spooling device DRB1: June 19, 1984 02:25 PM Atari, Inc. Printing document: (11) INTEGRAL DISK DRIVE SPEC prelim Copies: 1 Delete after printing: No Table driven file: DRA0:[376,10]WPSLP.DEF ATARI 1450XL HOME COMPUTER INTEGRAL DISK DRIVE SPECIFICATION ====== NOTICE ====== TO ALL PERSONS RECEIVING THIS DOCUMENT ------------------------ Confidential Information ------------------------ ------------------------------------------------------------------ Reproduction of this document is forbidden without the specific written permission of ATARI, INC., Sunnyvale, CA 94086. No right to reproduce this document, or the subject matter thereof, is granted unless by written agreement with, or written permission from the Corporation. ------------------------------------------------------------------ C062063 - Preliminary INTEGRAL DISK DRIVE Specification - Preliminary T_A_B_L_E_ O_F_ C_O_N_T_E_N_T_S_ 1.0.0.0 INTRODUCTION 2.0.0.0 RELEVANT DOCUMENTS 3.0.0.0 OVERVIEW 4.0.0.0 PERFORMANCE 5.0.0.0 INTERFACE SPECIFICATIONS 6.0.0.0 SOFTWARE EXTERNAL REFERENCE SPECIFICATION F_I_G_U_R_E_S_: 5.01 - ATARI 1450XL Home Computer (3/4 view) 5.02 - Integral Disk Drive Mechanical Details C062063 - Preliminary INTEGRAL DISK DRIVE Specification - Preliminary 1.0.0.0 I_N_T_R_O_D_U_C_T_I_O_N_ This document details the engineering design specifications for the integral Disk Drive of the ATARI 1450XL Home Compu- ter. It is the major information transfer document for the transfer of information from the Hardware and Software Devel- opment groups to Manufacturing, Design Assurance, and Appli- cations Software organizations. It covers all aspects of the Disk 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 - C061611 ATARI Single Density Floppy Diskette Specification - C016884 ATARI Double Density Floppy Diskette Specification - C016890 ATARI 1050 Disk Drive Specification - C061272 ATARI Personal Computer System, Operating System User's Manual Tandon TM50-2 Product Specification and User's Manual Parallel Bus Interface (PBI) Specification - C061902 ATARI SIO Specification - 81-PS-0602 3.0.0.0 O_V_E_R_V_I_E_W_ The ATARI 1450XL Home Computer Integral Disk Drive shall be a rotating disk memory designed for random access data entry, storage, and retrieval applications. Typical applications include storing programs and data, and loading programs into the system. The drive shall be capable of reading both sides of a disk- ette in single density or double density formats, at the user's discretion. C062063 - Page 1 INTEGRAL DISK DRIVE Specification - Preliminary 4.0.0.0 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 Temperature Operating (media dependent) -- 10 degrees C to 46 degrees C (50 degrees F to 115 degrees F) Non operating -- -40 degrees C to 71 degrees C (-40 degrees F to 160 degrees 4.1.2.0 Relative Humidity Operating, noncondensing (media dependent) -- 20 to 80 percent Nonoperating, noncondensing -- 5 to 85 percent 4.1.3.0 Altitude 152.4-meters (500-feet) below sea level to 15,240-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 5-1/4 inch diskettes with a media life (for reference only) of 4x10^6 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 of 0.529-millimeters (20.8 milinches). The drive head life shall be 20,000 media contact hours. The disk rotational speed shall be 288 RPM (plus or minus 1.5 percent). There shall be an average rotational latency of 104 milliseconds, with an instantaneous speed variation (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 an average 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 shall be 5,535 for side 0 and 5,877 for side 1. C062063 - Page 2 INTEGRAL DISK DRIVE Specification - Preliminary The unformatted recording capacity shall be 520,800 bytes per diskette. 4.3.0.0 R_e_l_i_a_b_i_l_i_t_y_ 4.3.1.0 Error Rates Exclusive of external sources, such as electronic equipment, and defective or contaminated diskettes. Recoverable soft errors -- 1/10^9 bits Recoverable hard errors -- 1/10^12 bits Seek Errors -- 1/10^6 seeks 4.3.2.0 MTBF and MTTR MTBF -- 8,000 hours, 25 percent duty cycle MTTR -- 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 milliamps average. +5 volts DC plus or minus 0.25 volt at 800 milliamps, maximum, with less than 100 millivolts peak-to-peak ripple. C062063 - Page 3 INTEGRAL DISK DRIVE Specification - Preliminary 5.0.0.0 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 will be a low profile that will be installed at the top right of the computer console (see Figure 5.01). An activity indicator <LED?>, located on the front panel is to be automatically 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 be locked 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 Description When the user inserts a diskette into the drive, it will be held in place by aluminum guard rails. The diskette will slide into the drive until a back stop is encountered, which will latch the ejection mechanism. Closing the front latch will activate the cone clamping mechanism, which will accurately center the diskette and clamp it into place. The drive hub is held to a constant rotation of 288-RPM by a servo-controlled DC motor. The heads will remain in contact with the diskette until the front latch is opened. The drive heads will be positioned over the desired track by means of a 4-phase stepper motor-band assembly and associated electronics. The positioner will use a one step rotation to cause a one track linear movement. When the front latch is opened, the cone clamping mechanism will raise, allowing for the free exit of the diskette. The eject mechanism will then unlatch and force the diskette part way out of the drive. 5.2.2.0 Mechanical Details Refer to Figure 5.02. The drive will have a Track 0 sensor, which will detect when the Head-Carriage Assembly is posi- tioned Track 0 on the diskette. It will also have a write protect sensor which will disable the write electronics when a tab covers the write protect notch on the diskette. C062063 - Page 4 INTEGRAL DISK DRIVE Specification - Preliminary The drive spindle will be belt driven by a DC motor which will contain an integral tachometer. The servo control circuit and tachometer will control the speed of the spindle. The Read/Write Head Assembly will be positioned by a split band positioner mounted to a stepper motor. The read/write heads will be glass bonded ferrite ceramic structures and have a life expectancy of 20,000 operating hours. The electronic components will be mounted on two printed circuit boards. The logic circuit board is to be mounted above the chassis. The motor control circuit board is to be mounted on the bottom of the chassis. 5.2.3.0 Power and Interface Signals Power and the interface signals are to be routed through two 23-pin connectors which will plug di- rectly into the CPU board. The connectors will mate directly with the circuit board connectors at the rear of the drive. The first connector is for Drive 1; the second is for Drive 2. The pin assignments are as follows: 1-4 Write Protect 5-7 Diskette Enable 8-11 Track 0 Sensor 12-17 Stepper Motor Control 18-21 Spindle Motor Control 22-23 Disk Activity Light 5.2.4.0 Cooling Fan A ??-inch cooling fan shall be placed on the rear of the disk drive. It shall draw +12-volts, 0.15-a from <?????>. ...
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