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READ THIS FIRST INSTALLATION GUIDE WDAT-440 Adapter Board for Intelligent Storage Peripherals and Integrated Drives Radio Frequency Interference Statement This Western Digital product has been certified to comply with the limits for a Class B computing device pursuant to subpart J of Part 15 of FCC rules. This does not guarantee that interference will not occur in individual installations. Western Digital is not responsible for any television, radio, or other interference caused by unauthorized modifications of this product. If interference problems do occur, please consult the system equipment owner's manual for suggestions. Some of these suggestions include relocation of the computer system away from the television or radio or placing the computer AC power connection on a different circuit or outlet. This product was tested and certified with a shielded interconnecting cable; therefore, a shielded cable is required to be used with this product. This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. Trademarks used in this text: IBM and AT are registered trademarks of International Business Machines Corporation. ******************************************************************** INTRODUCTION ******************************************************************** The WDAT-440 is a printed circuit board that connects an IBM AT or compatible computer to intelligent storage peripherals or integrated hard disk drives and other peripheral devices. The WDAT-440 provides an integrated hard disk interface, floppy controller, serial interface, and a parallel interface. The WDAT-440 adapter board can be used with either the Western Digital intelligent storage peripherals or other manufacturers' integrated disk drives. The WDAT-440 interfaces allow you to attach the following devices to your computer: two hard disk drives and two floppy disk drives, plus any additional devices which can be attached to the two serial ports and one parallel port. This document describes installation of the WDAT-440 in the IBM AT computer and compatibles. ******************************************************************** UNPACKING THE ADAPTER BOARD ******************************************************************** CAUTION Hold the adapter board by the ends. Static electrical discharge can permanently damage components if the board is not carefully handled. Remove the board from its anti-static pouch and inspect it for any visible signs of damage (scratches, loose components, broken connectors). Contact the dealer if there is damage. Retain any packing materials for reuse if it becomes necessary to return your WDAT-440 board. 1 SOME PRELIMINARY STEPS Before you begin the actual installation of the hardware, there are some preliminary steps that you need to do. ******************************************************************** GATHER SUPPLIES ******************************************************************** The installation requires that you gather the following tools and supplies. - screwdriver - AT-compatible computer with space to hold the internal device(s) - intelligent storage peripheral(s) or integrated hard disk drive(s) - interface cables (hard and floppy) - serial and parallel cables (optional) - installation manual for AT-compatible computer - installation manual for intelligent storage peripheral(s) or integrated hard disk drive(s) ******************************************************************** IDENTIFY COMPONENTS ******************************************************************** The WDAT-440 board works with Winchester hard disk drives that have the AT intelligent storage peripheral or integrated drive interface and floppy drives with an AT-type interface. Look in your drive manuals to verify that you have an AT intelligent storage peripheral or integrated hard drive and an AT-type floppy drive or check with your dealer. This board does not work with XT drives. If you have an XT drive you need the WDXT-140R board or simlar product. Components You should have the following items and be able to identify them - intelligent storage peripherals or integrated drives (1 or 2) - cable for intelligent storage peripheral or integrated drive (40 pin in daisy chain configuration) - floppy disk drives (1 or 2) - 360K, 720K, 1.2M, or 1.4M in 5 1/4" or 3 1/2" form factor - cable for floppy drive (34 pin in daisy chain configuration) You need to know the types of components that you plan to connect to your adapter board because some settings depend on the types of components attached to it. If you plan to connect a 25 pin serial device to your WDAT-440 board, see Appendix C. ******************************************************************** IDENTIFY BOARD ******************************************************************** Figure 1-1 shows the connector locations (J1, J2, J5, J7, and J8) on the WDAT-440 board and the location of the jumper blocks (W3 to W9). Look at your board and locate each connector and jumper block. Familiarize yourself with these locations. Note the connector and jumper names are also marked on the board itself. J5 Hard J1 Floppy J8 Serial ┌───────────────────────────────────────────────────────────────────────┐ │ ┌─────40 Pin────────┐ ┌─34 Pin──────┐ ┌9 Pin─┐ │ │ └───────────────────┘ └─────────────┘ └──────┘ │ │ ∙ ∙ W3 W5 . . │─┐ │┌─┐ ∙ ∙ 1 2 J7 Serial │ │ J6 │ 1 3 9 Pin │─┘ │└─┘ │ │LED (4 Pin) │─┐ │ . . J2 │ │ │ . . W4 Parallel │ │ │ . .W8 . . 25 Pin │ │ │ . . . . W9 W7 │ │ │ . . 1 3 . . 2. . . . │─┘ │ . . 1. . . . │ │ 1 3 │ │ W6 │ │ . . │ │ WDAT-440 1 2 │ └─┐ ┌─┐ ┌───────────────┘ └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘ └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘ P2 P1 CAUTION Handle the WDAT-440 board by the ends of the board. Some of the chips are static sensitive and damage may occur if the board is incorrectly handled. ******************************************************************** JUMPERS ******************************************************************** A jumper block and a jumper plug combination, together, when installed or removed between a pair of pin locations on a board, turn certain functions on or off. These functions define the peripheral hardware to your computer. Western Digital set the jumper combinations for the most common applications. It is unlikely that you will need to change any of the jumper settings. Jumper Settings The WDAT-440 board contains seven jumper blocks, W3 to W9, which define hardware parameters. By moving the jumper plugs, you can change the definition of the hardware which is attached to your computer. The jumper settings must match your physical system. The jumpers at W3 and W9 define the intelligent storage peripheral or integrated hard disk drive interface, the jumpers at W4 and W5 define the floppy address and drive speed, the jumpers at W7 and W8 define the parallel and serial ports, and the jumper at W6 defines the chassis to ground logic. Jumper settings are listed in Appendix B Tables B-1 through B-6. The factory default settings are identified with "*" symbols. Standard Jumper Settings (W3 to W9) The following is a list of the factory default jumper settings. This is how Western Digital defines the hardware attached to the WDAT-440 board. - W3 with pins 3 and 4 connected passes the hardware interrupt IRQ14) value for the hard disk without delay to your computer - W4 with pins 1 and 2 connected activates the floppy drive and sets its address at 3F0-3F7 - W5 with pins 1 and 2 open sets the floppy drive as a single speed floppy drive - W6 with pins 1 and 2 open sets chassis ground independent of logic ground - W7 with pins 3 and 4 connected and pins 5 and 6 connected and pins 7 and 8 connected sets the parallel printer hardware interrupt as IRQ7, sets the serial hardware interrupt as IRQ3 for COM2, sets the serial hardware interrupt as IRQ4 for COM1 - W8 with pins 1 and 2 connected and pins 5 and 6 connected and pins 9 and 10 connected enables the parallel printer, sets the parallel printer hardware address to LPT1 & (378-37F), sets the address for the external serial port to COM1 & (3F8-3FF), sets the address for the internal serial port to COM2 & (2F8 -2FF) - W9 with pins 1 and 2 connected and pins 3 and 4 connected activates the intelligent storage peripheral or integrated hard disk drive interface Do I Need To Change Any Jumpers? No. Do NOT change any jumper settings on your WDAT-440 board, unless you have one of the following conditions: - You want to delay the hardware interrupt (IRQ14) signal. - You want to disable the floppy drive controller or set an alternate address at 370-377. - You have a 2-speed floppy drive. - You want to change printer port or serial port definitions or addresses. You can change the jumper settings to re-configure the parallel port as LPT2. You can also re-configure the external serial port as COM3 and the internal serial port as COM4 by moving the jumpers. NOTE Change the jumper settings before you install the WDAT-440 board into your computer. Go to Appendix B for instructions. 2 HOW TO INSTALL YOUR HARDWARE Before you begin the actual installation of the WDAT-440 hardware, you need to prepare and install your intelligent storage peripherals or integrated drives and floppy disk drives. Steps 1, 2 and 3 below refer to these procedures. Important Before you install the WDAT-440 board, determine whether you plan to change any of the jumpers. Change any jumpers before you install the board. 1. Turn your computer power switch OFF and unplug the power cord. Then remove the computer cover. See manufacturer's manual for details. 2. Look in your intelligent storage peripheral or integrated drive manual and follow the steps to configure and to install your intelligent storage peripheral(s) or integrated drive(s). These steps include setting the drive number, attaching the cable(s) to each drive, and mounting the drive(s) into the computer case. Be sure that you attach your drive(s) to a power source. If you have two drives, know which drive is set as the first drive and which is set as the second drive. Since the WDAT-440 board has only one integrated drive connector, you must daisy chain your intelligent storage peripherals or integrated hard drives. 3. Look in your floppy drive manual and follow the steps to configure and to install your floppy drive(s). These steps include setting the drive number and termination resistor, attaching the cable(s) to each drive, and mounting the drive(s) into the computer case. Be sure that you attach your drive(s) to a power source. If you have two drives, know which drive is set as the first drive and which is set as the second drive. Since the WDAT-440 board has only one floppy drive connector, you must daisy chain your floppy disk drives. │ │ │ │ │ Cable from Integrated Drive or │ │ │ │ │ │ │ │ │ │ Integrated Storage Peripheral │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ *ooooooooooooooooooo ooooooooooxoooooooo@ x=Pin 20 &=Pin 34 ┌───────────────────────────────────────────────────────────────────────┐ │ *=Pin 1 ooooooooooxoooooooo@ oooooooooooooooo& │ │ *ooooooooooooooooooo @=Pin 40 *o5oooooooooooooo │ │ J5 (Hard) J1(Floppy) │ │ │ │ Pin 5 │ │ (keyed) │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ └─┐ ┌─┐ ┌───────────────┘ └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘ └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘ P2 P1 Figure 2-1. Connect Pin 1 to Pin 1 4. Connect the interface cable(s) from the intelligent storage peripheral(s) or integrated drive unit(s) and floppy drive(s) to the WDAT-440 adapter board. See steps A and B below. A. Attach the integrated drive interface cable 40 pin connector from the integrated hard drive to J5 on the adapter board. Attach Pin 1 of the cable connector to Pin 1 on the adapter board. See Figure 2- 1. Pin 1 of the cable connector is marked and is on the color coded edge of the cable. Pin 20 on the WDAT-440 board is keyed. Do NOT force the cable and connector. B. Attach the floppy drive interface cable 34 pin connector from the floppy drive to J1 on the adapter board. Attach Pin 1 of the cable connector to Pin 1 on the adapter board. Pin 5 on the WDAT-440 board is keyed. Do NOT force the cable and connector. 5. After you have installed all the intelligent storage peripheral(s) or integrated hard disk drive(s) and floppy disk drive(s) into the computer case, secured them in place, and attached the cables, look and see which expansion slots are empty. Select one that has the same type of connectors as those on the WDAT-440 board. Use an empty slot which is as close to the intelligent storage peripheral(s) or integrated hard disk drive(s) and floppy disk drive(s) as possible. 6. Loosen the screw that holds the expansion slot cover you selected in step 5. The screw is located at the rear. Slide the expansion slot cover up, and remove it. Save the expansion slot cover for possible future use. 7. Hold the WDAT-440 board by the top corners and slide it into the expansion slot. The WDAT-440's edge connectors fit into the computer's motherboard expansion slot. Press on the board as you insert it into the expansion slot. Check that the board is seated properly by pressing down firmly on both ends of the board. The parallel and one serial connector should be outside the computer case. 8. After the board is seated firmly in the expansion slot socket, secure the board using the screw that you loosened in step 6. Place the screw over the board bracket and expansion slot cover. Then screw the board and slot cover to the computer case. 9. Connect any internally attached serial device. Attach a cable from the serial device to the internal serial connector (J8) on the WDAT-440 adapter board. If your serial device has a 25 pin serial connector, then you'll need a DB9-to-DB25 adapter cable. See Appendix C. 10. Replace the computer cover. Make sure that cables are out of the way and not caught between the cover and boards. Check that the cables do not obstruct the air flow path from the fan or vents. 11. Plug the power cord back into your computer and turn the power switch ON. Your hardware installation is complete. 3 ******************************************************************** HOW TO CHECK YOUR INSTALLATION ******************************************************************** After you have completed the hardware installation and installed other software required by the integrated drive, you are ready to start using your system. Start System From Hard Disk You are ready to start your system using your newly installed hard disk drive. Remember: You must remove the diskette from drive A or else the system will start from drive A. Note Use your park utility (if you have one), before you turn the computer power OFF. To check the installation, you will start the system after the power has been turned off. 1. Turn the computer power OFF and wait 30 seconds. 2. Turn the computer power ON. 3. The system should respond, several screens may flash, and finally the C>> prompt will appear. You may have to enter the date and time before the C>> prompt appears. This depends on how your system is set. Check Floppy Drives To check that the floppy drive controller works, do the following for each floppy drive that you installed: 1. Insert a floppy diskette into the floppy drive. 2. Check that you can read a diskette. Check Serial Ports To check that the serial ports work, do the following for each serial port that you installed: 1. Attach a serial device to each serial port that you installed. 2. Check that you can read and write to that serial port. Check Parallel Port To check that the parallel port works, do the following to the parallel port that you installed: 1. Attach a parallel printer to the parallel port that you installed. 2. Check that you can print to that parallel port. Installation Complete You are now done. The next time you can start your computer system from the hard disk, use your newly installed floppy disk drives, and devices attached to your two serial ports and one parallel printer port. 4 HOW TO HANDLE PROBLEMS If you had a problem with your system, first re-read the instructions to be sure that you followed them correctly. Check that you typed information EXACTLY as instructed. Repeat the procedure a second time to verify that you get the same error, then check the next section, "If You Have a Problem." If You Have a Problem First check your physical installation. Check for reversed cables, an overloaded system power supply, incorrect drive selection, etc. CAUTION Turn the power OFF before you open the computer case and attempt to reverse the cables, etc. Always use your park utility. This section lists some common problems and possible solutions to try if you have problems when you install your adapter board. PROBLEM: Winchester activity LED on front of drive is always on. SOLUTION: Check cable connections. Check that pin 1 is connected to pin 1 and, if not, reverse connection. Replace cables. Check whether the intelligent storage peripheral or integrated hard disk drive has malfunctioned. PROBLEM: "Error Reading Fixed Disk" when starting the system. SOLUTION: DOS partition not active. See FDISK instructions in your DOS manual. PROBLEM: Floppy drive doesn't respond when reading a diskette. SOLUTION: Check cable connections. Check that pin 1 is connected to pin 1 and, if not, reverse connection. Replace cables. Check whether the floppy disk drive has malfunctioned. Also check jumper settings for floppy drives. PROBLEM: Serial or parallel ports don't respond when devices attached. SOLUTION: Check serial or parallel cable connections. Replace serial or parallel cable. Check jumper settings for serial or parallel ports. PROBLEM: System hangs during multiple sector read or write. IRQ14 signal needs to be delayed until ACTIVE signal goes high. SOLUTION: Check that jumper W3 is set to delay IRQ14. Pin 1 is connected to pin 2 and pins 3 and 4 are open (not connected). This is the opposite of the Western Digital default. See Appendix B. PROBLEM: None of the suggestions seem to help. SOLUTION: Call your dealer. A SPECIFICATIONS Physical Dimensions Length: 12.58 centimeters (4.95 inches) Width: 10.67 centimeters (4.20 inches) Height: 1.27 centimeters (.50 inches) maximum Electrical Voltage: +5 VDC, +/-5%; +12 VDC, +/-10%; -12 VDC, +/-10% Current: 0.8 A (5V); 0.2 A (12V); 0.3 A (-12V); Ripple: 0.1 V (maximum), 25 mV (typical) Environmental Ambient temperature: 0o C to 65oC Non-operating: - 40o C to 70oC Temperature change: 20o C per hour maximum Relative humidity Operating: 8% to 85%, non-condensing Non-operating: 5% to 95%, non-condensing Altitude Operating: 0 to 3000 meters (10,000 feet) Non-operating: 0 to 5000 meters (16,500 feet) Vibration Operating: 0.38 mm(5-50 Hz) 1 G (50-2000 Hz) (3 octaves/min - 15 min/axis) Shock Non-operating: 50 G 11 msec, 3 axes (3 shock per axis) Operational Parameters Host Interface Type: PC-AT Cable: none, 62 pin & 36 pin card edge connectors Hard Disk Drive Interface Type: 40 pin, 2 row headers Cable: one foot maximum Floppy Drive Interface Type: 34 pin, 2 row headers Cable: three meters maximum, daisy chain Method: MFM, FM Rate: MFM 500 KBS, 300 KBS, 250 KBS FM 125 KBS Write Precomp: 125 nsec or 187nsec (early/late) Format: 512 bytes/sector sectors/track: 5 125 KBS 9 250 KBS 9 300 KBS 15 (5.25" media) 500 KBS 18 (3.5" media) 500 KBS Drives: 2 (max) Capacity: 360K, 720K, 1.2M, or 1.44M Heads: 2 (max) Cylinders: 80 (max) Error Rate: Hard: < 1x 10(E12) bits read Soft: < 1x 10(E09) bits read Seek: < 1x 10(E06) seeks Error Detection: < x16 + x12 +x5 +1 (data and ID fields) Bit Jitter Tolerance 60% of window (min) Capture Range +/- 6% (min) Serial Interface Type: 9 pin, (internal & external) Cable: DB9 connector to DB25 Method: Asynchronous Parallel Interface Type: 25 pin, 2 row headers (AT-type DIN) B JUMPERS The WDAT-440 board has jumper blocks at W3 to W9. Adding or removing a jumper shorting plug at any of these locations, defines a hardware configurations which is different from the default value selected by Western Digital. Jumper Functions (W3 to W9) The following list explains the jumper functions. - W3 sets the hardware interrupt (IRQ) value for the hard disk - W4 enables or disables the floppy drive and selects its address - W5 selects the floppy drive speed (single or double) - W6 sets ground to chassis logic - W7 & W8 set the serial and parallel port parameters - W9 enables or disables the intelligent storage peripheral or integrated drive interface Delay Hardware Time IRQ14 (W3) Most hard disks do not require that you delay the IRQ14. Thus Western Digital set this value so that the IRQ14 signal is passed through to the host computer without a delay. However, some hard disks do require you to delay the IRQ14 signal until the ACTIVE signal goes high. Your hardware manufacturer should tell you when this is necessary. See your intelligent storage peripheral or integrated hard disk drive manual. If you do set up your system without changing the IRQ14 delay time and your intelligennt storage peripheral or integrated hard disk requires a delay time, then your system will hang during a multiple sector read or write. If your system hangs during a multiple sector read or write, check that jumper W3 is set to delay IRQ14. Pin 1 should be connected to pin 2 and pins 3 and 4 should be open (not connected). This is the opposite of the Western Digital default. ******************************************************************** JUMPER SETTINGS ******************************************************************** The WDAT-440 board contains seven jumper blocks, W3 to W9, which define peripheral hardware attached to your computer. The various jumper settings are listed in Tables B-1 through B-6. The factory default settings are identified with "<*>" symbols. Default Values Tables B-1 through B-6 list the jumper settings. Default factory settings are marked with a "*" symbol. Table B-1. (W3) Select Delay Hardware Interrupt IRQ14 Pins Status Function 1-2 closed IRQ14 enabled when active signal is false, delays IRQ til ACTIVE goes high 3-4 closed* IRQ14 passed through to host bus, no delay Table B-2 (W9) Select Hard Disk Drive Interface Pins Status Function 1-2 & 3-4 open Disable intelligent storage peripheral or integrated drive interface 1-2 & 3-4 closed* Enable intelligent storage peripheral or integrated drive interface B-3. (W4) Select Floppy Drive & Floppy Address Pins Status Function 1-2 closed* Floppy enable 1-2 open Floppy disable 3-4 open* Floppy address 3F0-3F7 3-4 closed Floppy address 370-377 B-4. (W5) Set Floppy Drive Speed* Pins Status Function 1-2 closed 2 speed drive 1-2 open* Single speed drive B-5. (W7) Set Parallel & Serial Ports Pins Status Function 1-2 closed PRN INT = IRQ5 3-4 closed* PRN INT = IRQ7 5-6 closed* COM2 INT = IRQ3 5-7 closed COM2 INT = IRQ4 6-8 closed COM1 INT = IRQ3 7-8 closed* COM1 INT = IRQ4 Table B-6. (W8) Set Parallel & Serial Addresses Pins Status Function 1-2 closed* PRN enable 1-2 open PRN disable 3-4 open* PRN address, LPT1= 378-37F 3-4 closed PRN address, LPT2= 278-27F 5-6 closed* Ext COM = COM1 (3F8-3FF) 7-8 closed Ext COM = COM3 (3E8-3EF) 9-10 closed* Int COM = COM2 (2F8-2FF) 11-12 closed Int COM = COM4 (2E8-2EF) *Default setting values 1-2 (closed) indicates pin 1 connected (jumpered) to pin 2. 1-2 (open) indicates pin 1 not connected to pin 2. ******************************************************************** CHANGING JUMPER SETTINGS ******************************************************************** When you have one of the special conditions listed in the section "Do I Need To Change Any Jumpers?", you need to change a jumper setting. In all other cases, do NOT change the jumper settings. - To delay the hardware interrupt (IRQ14) signal, change the jumper at W3 - To disable the floppy drive controller or set an alternate address at 370-377, change the jumper at W4 - To change the floppy drive speed, change the jumper at W5 - To change printer port or serial port definitions or addresses, change jumpers at W7 & W8 ******************************************************************** HOW TO CHANGE JUMPERS ******************************************************************** To change a jumper, you need to either add or remove a tiny jumper plug or bar. The jumper plugs or bars necessary for the default values are supplied by Western Digital. You may need to purchase extra jumper plugs, depending on which settings you want to change. The jumper plugs are available at most electrical suppliers. A typical jumper plug is Berg P/N 76438-101. First determine which jumper settings you need to change. These depend on the parameters you want to change. Table B-1 to B-6 list the definitions for each jumper setting arranged by jumper blocks. Look at Tables B-1 through B-6 and locate the correct table. Then change the setting according to the values listed in the table. See the example on the next page for exact details. EXAMPLE From the information in Chapter 1 and by looking at Table B-6, you see that the WDAT-440 board is set for LPT1 with address 378-37F. If you have a system that already has a port called LPT1 with address 378-37F, then you will have to change the WDAT-440 board's parallel port address. You also see from Table B-6 that the default value for the W8 jumper block is with pins 3 and 4 (open) not connected and the new value (LPT2) will have the W8 jumper block with pins 3 and 4 (closed) connected. This requires that you obtain a tiny jumper plug (Berg P/N 76438-101). To change the jumper setting from the default value at W8 with pins 3 and 4 (open), you take the jumper plug and place it across the W8 jumper block so that pins 3 and 4 (closed) are connected. This changes the WDAT-440 board's parallel port address from LPT1 to LPT2. C SERIAL INTERFACE The WDAT-440 board has two possible asynchronous serial ports. The external port at J7 can be configured as either COM1 or COM3. The internal port at J8 can be configured as either COM2 or COM 4. The jumper setting and corresponding address of the ports determines which values are used. See Tables B-5 and B-6 in Appendix B. Either port can be disabled to avoid conflicts with other serial ports already in your system. Peripheral Connection (DB25-DB9) The WDAT-440 board has DB9 serial connectors. Since most serial peripheral devices use DB25 connectors, you may need a DB9-to-DB25 adapter cable to connect your 25 pin serial device to the WDAT-440 board's 9-pin serial connectors. PIN CONVERSION (DB9-DB25) The WDAT-440 board's serial port pin conversion is shown in Table C- 1. Table C-2 shows the J7 and J8 signal descriptions. Table C-1. DB9-to-DB25 Serial Port Conversion Pinout DB9 Pins Mnemonic DB25 Pins 1 RLSD 8 2 RXD 3 3 TXD 2 4 DTR 20 5 GND 7 6 DSR 6 7 RTS 4 8 CTS 5 9 RI 22 Table C-2. Serial Connector (DB9) Pin Description J7 & J8 Mnemonic Signal Name Description 1 1 RLSD Receive line signal Data carrier detected detected 2 3 RXD Received data Serial data input 3 5 TXD Transmitted data Serial data output 4 7 DTR Data terminal ready Terminal ready to receive data 5 9,10 GND Ground Logic ground 6 2 DSR Data set ready Modem ready to exchange data 7 4 RTS Request to send Signal used to enable modem 8 6 CTS Clear to send Modem ready for data transmission 9 8 RI Ring indicator Telephone ringing signal received COPYRIGHT 1989 WESTERN DIGITAL CORPORATION ALL RIGHTS RESERVED INFORMATION FURNISHED BY WESTERN DIGITAL CORPORATION IS BELIEVED TO BE ACCURATE. HOWEVER, NO RESPONSIBILITY IS ASSUMED BY WESTERN DIGITAL CORPORATION FOR ITS USE; NOR FOR ANY INFRINGEMENT OF PATENTS OR OTHER RIGHTS OF THIRD PARTIES WHICH MAY RESULT FROM ITS USE. NO LICENSE IS GRANTED BY IMPLICATION OR OTHERWISE UNDER ANY PATENT OR PATENT RIGHTS OF WESTERN DIGITAL CORPORATION. WESTERN DIGITAL CORPORATION RESERVES THE RIGHT TO CHANGE SPECIFICATIONS AT ANY TIME WITHOUT NOTICE. Doc. No. 79-000414 Western Digital 2445 McCabe Way Irvine, CA 92714 (800) 847-6181 (714) 863-0102 FAX (714) 863-1656 TLX 910-595-1139 Technical Support (800) 777-4787 Bulletin Board Support (714) 756-8176 WD0073S 6/89