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AST RESEARCH MegaPlus II, User Manual

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Summary of Contents for MegaPlus II

Page 1: ...TM User s Manual Af 1 RESEARCH INC ...

Page 2: ...MegaPlus II Memory Expansion and 1 0 Card for the IBM Personal Computer IBM PC XT and Other PC Compatible Systems User s Manual August 1983 AST RESEARCH INC Irvine California 714 540 1333 ...

Page 3: ...paq is a trademark of Compaq Computers Inc MegaPlus II MegaPak SuperPak SuperDrive and SuperSpool are trademarks of AST Research Inc Copyright 1983 AST Research Inc All rights are reserved including those to reproduce this book or parts thereof in any form without permission in writing from AST Research Inc ...

Page 4: ...ple Memory Boards 2 8 2 4 1 Installing a Board Below the MegaPlus 1I 2 8 2 4 2 Installing a Board Above the MegaPlus II 2 9 2 5 Installing Additional Memory on the MegaPlus II 2 9 2 6 Troubleshooting Memory Problems 2 10 SECTION 3 SERIAL ASYNCHRO OUS COMMUNICATION 3 1 3 1 Setting Up Serial Port 1 3 2 3 2 If Your System Already Has a Serial Port 3 2 3 3 RS 232 Connector Pin List for Serial Port 1 3...

Page 5: ...e and Date 5 3 5 4 Device Addressing of the Clock Calendar 5 4 5 5 Disabling the Clock Calendar on Your MegaPlus II 5 4 SECTION 6 MEGAPAK 6 1 SECTION 7 GAME ADAPTER PORT 7 1 7 1 Installing the Game Adapter Piggyback Board 7 1 7 2 Device Addressing of the Game Adapter 7 1 7 3 Disabling the Game Adapter Port 7 2 SECTIO ol 8 INSTALLING YOUR MEGAPLUS II BOARD 8 1 8 1 Testing the New Installation 8 2 S...

Page 6: ...Switch Settings 2 5 Figure 2 5 PC 2 System Board Switch Settings 2 6 Figure 2 6 PC XT System Board Switch Settings 2 7 Figure 7 1 Game Adapter Piggyback Board Layout 7 2 Figure E l The Ideal Terminal to Modem E 3 Figure E 2 Example of a Specific DTE to DTE Interface E 4 Figure E 3 AST Research Board s Serial Port DTE to NEC 7700 Series Serial DTE Printer E 6 Figure EA Serial Interface Form Schemat...

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Page 8: ...ng additional memory and expand the capacity of some of your existing programs such as spreadsheet models As a bonus AST Research gives you two valuable utility programs SuperDriveTM a disk emulation program allowing you to use part of your memory as a superfast electronic disk drive and SuperSpoolTM an intelligent print spooler allowing you to output files to a printer without tying up your PC Th...

Page 9: ...olTM clock software and the RAMCLEAR memory initialization utility program NOTE For information on the SuperPak utilities see your SuperPak User s Manual Available options A Parallel printer port to be used for connecting a parallel printer to the Pc A Second RS 232C Serial port serial 2 configurable as DTE or DCE The MegaPakTM providing 128K or 256K of additional memory which brings the MegaPlus ...

Page 10: ...s not fully populated then the AST Research Memory Upgrade Kit PIN MP 9 can be used for this purpose The maximum memory capacity of this system is 640K 3 The PC XT comes standard with 128K of memory The system board is expandable to 256K Unlike the PC 2 the system board does not have to be fully populated before using expansion board memory you may however use the AST Research Memory Upgrade Kit P...

Page 11: ... II board provides and you have a 64K PC l system with no current I O options other than the printer port on an IBM Monochrome Adapter all you have to do is to set the PC system switches for the amount of memory your system will have with your MegaPlus II board installed and you re set to go However we strongly recommend that you thumb through this manual at your leisure and read up on the SuperPa...

Page 12: ...4 _ LJ L J rot J 00 256K I jJJJJJJJJJJdJJJJJJJtt JI U u ASIt 1 r 021 1 04 001 201 1 0 Screw Set Assembly M Screw Set Assembly To locate pin 1 of an integrated c ircuit IC find the notch on the chip assembly Screw Set Assembly S1 Swltch 1 Game Adapter Piggyback Board Interface Connector Notch Pin 1 f1 o Parallel Port Output Selection Jumper Block For Sec uring Optional MegaPak Board For Securing Op...

Page 13: ... shown Keywords can be entered in any combination of upper and lowercase letters 2 Square brackets indicate an optional term which is included or omitted at the user s discretion The brackets are not part of the input 3 Lowercase letters represent user defined parameters These parameters must satisfy the conditions specified in the command description 4 Pressing the Enter key is not necessary unle...

Page 14: ... PC and install the MegaPlus II board into one of the empty slots in your PC s system board This manual has all of the necessary instructions Instructions for removing the cover and setting the switches on your system board are also contained in your IBM Personal CompUTer Guide to Operations CAUTION Be sure that the power switch is otT and the A C cord is removed from the system unit Turn oft any ...

Page 15: ...h Settings Switch 1 refer to Figure I I on the MegaPlus II board controls two different functions related to the memory on the board The two functions which must be configured are I The starting address of the MegaPlus II board 2 Parity checking enabled or disabled These functions are controlled by setting various positions of Switch I The following two sections describe these switch settings for ...

Page 16: ... PC I configure the MegaPlus II s starting address to the 64K setting in Figure 2 2 PC 2 When installing the MegaPlus II board in a PC 2 a Compaq or other compatible system with a 256K system board configure the MegaPlus II s starting address to the 256K setting in Figure 2 2 MegaPlus II Starting Memory Address Maximum Usable RAM Starting Address S1 S2 S3 S4 On MegaPlus II 64K 10000 ON ON ON OFF 5...

Page 17: ...ts between memory on the MegaPlus II and areas reserved for the monochrome and color display boards 2 2 2 Parity Check Enable Position 7 of Switch 1 on your MegaPlus IJ board can be set to enable full parity error checking In order to ensure the highest possible data integrity it is recommended that the parity check function of the board always be enabled by leaving this switch ON If however you h...

Page 18: ...PC l System Board Switch Settings Figure 2 4 should be used if you are installing your MegaPlus II board in a PC I To determine the correct system board switch setting add together the amount of memory on the system board 64K and the amount of memory on the MegaPlus II Set the PC l system board Switch 2 to the corresponding total from Figure 2 4 Total Memory Installed in PC 1 Total Memor S1 S2 S3 ...

Page 19: ...OM BIOS installed then you can address a full 640K and you should use the switch settings for the PC 2 see Figure 2 S 2 3 2 PC 2 System Board Switch Settings Figure 2 S should be used if you are installing your MegaPlus II board in a PC 2 To determine the correct system board switch setting add together the amount of memory on the system board Total Memory Installed in PC 2 Total Memor t S1 S2 S3 ...

Page 20: ...switch tells the computer only the amount of memory installed on the system board and does not include any memory which may be installed on an expansion board such as the MegaPlus II The PC XT will automatically recognize the expansion board memory and will include this memory in the total system memory up to a maximum of 640K Furthermore it is not required that you fully populate the PC XT system...

Page 21: ...nstructions supplied with the other board configure it to reside immediately above the memory on the PC system board STEP 2 If there are any unused rows of memory sockets on the other board the unused rows must be disabled so that they will not contlict with the MegaPlus II Refer again to the other board s manual for information on how to disable these sockets If the unused memory sockets cannot b...

Page 22: ... board switches for the total amount of memory including the system board the MegaPlus II and the other board 2 5 Installing Additional Memory on the MegaPlus II A MegaPlus II board that is configured with less than its 256K maximum memory without the MegaPak option can be upgraded at any time by installing additional 64K RAM sets such as AST Research s Memory Upgrade Kit PIN MP 009 The correct ty...

Page 23: ...nstall the MegaPlus II board in the system unit and power up the PC Because there is now additional memory in the PC the powerup diagnostics will take longer to run If all goes well the system should operate normally and show the correct new total amount of memory when you run CHKDSK If you get an error recheck the installation of the new chips and the switch settings on both the system board and ...

Page 24: ...ta byte Referring to Figure I I notice that in Bank I each of the nine memory chip sockets contains a two digit value the sixth chip from the left edge of the board corresponds to a value of 20 so that would be the failing location for an error code of 4020 in a PC 2 In a PC I the problem would be in the sixth chip from the left edge of the board in Bank 4 of the MegaPlus II Once you have determin...

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Page 26: ...ires to signal one another This allows data transmissions in either direction to be controlled properly NOTE An extensive discussion on wiring RS 232 interfaces is presented in Appendix E The IBM PC allows up to two serial communication ports called COMI and COM2 Your MegaPlus II board s serial port 1 can be set up as either COM or COM2 COMI is the default factory setting The factory default setti...

Page 27: ...t make several simple changes to the jumpers on your MegaPlus II board 3 2 If Your System Already Has a Serial Port This discussion applies only to systems which will have more than one serial port in which the currently installed port is COM I If your present system has a serial port for example an IBM Asynchronous Communication Adapter or the PC XT with its standard serial board you shouldn t ha...

Page 28: ...hould be on position 4 the IRQ line for COM I To reconfigure your serial port 1 as COM2 you must move this jumper from position 4 to position 3 not 3S Your MegaPlus II board s serial port 1 is now configured as COM2 3 3 RS 232 Connector Pin List for Serial Port 1 In order to attach your PC s serial port to another serial device you must use a multiwire cable with the proper type male or female of ...

Page 29: ...s specific examples of interfaces that are cabled properly If you are using several remote devices which require different cabling arrangements consider using adapter plugs to handle the line signal routing That way you can use the same extension cable for all of your devices and simply change the adapter plug when you change device Serial Port 1 as a DTE Interface RS232C Jl Signal ame pin Signal ...

Page 30: ...the s option there should definitely be no serial ports in your PC system other than those on your MegaPlus II board PC DOS does not support more than two serial ports 3 6 Verifying Your Serial 2 Configuration Your serial 2 is factory set and ready to use as shipped You don t need to adjust any jumpers Just to verify that the jumpers are in their proper positions check the positions of the two jum...

Page 31: ...type interface is best used to connect your serial port 2 to a remote printer terminal or other DTE type device 3 8 Setting Up Serial 2 for DCE Configuration The DCE configuration allows pin for pin wiring to a remote DTE type port This helps save the time and expense of constructing a special cable for connecting like interfaces see Appendix E A jumper selects either the DTE or DCE pin connectors...

Page 32: ...erial Port 2 as a DCE Interface J4 Pin Signal Name 1 Chassis Ground 2 TxD Transmit Data 3 RxD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 SG Signal Ground 8 DCD Data Carrier Detect 20 DTR Data Terminal Ready 22 RI Ring Indicator NOTE AST Research serial ports do not support a current loop type interface 3 10 Installing the Serial 2 Interface Cable Signal Direction...

Page 33: ...ard Position the connector over the row of pins corresponding to the type of interface you have selected and gently press the connector onto that row of pins The connector should go on easily with an even gentle pressure Routing the Adapter Cable The adapter cable can be routed in a variety of ways If you have an older PC chassis with a cutout above the keyboard connection on on the back panel you...

Page 34: ...sing the port with a serial printer Many application programs such as word processors will handle this initialization of the port automatically thus makjng it unnecessary to use the MODE command Refer to your software manual if no mention is made of the MODE command then it is probably safe to assume that you can omit that step If you are unsure it will not harm anything to go ahead and use the MO...

Page 35: ... baud rate parity etc Again it is possible that your application program is handling this redirection automatically If so you can eliminate this step as well 3 12 Disabling Serial Port 2 Serial port 2 on the MegaPlus II board can be completely disabled by removing the jumpers discussed in Section 3 6 3 10 ...

Page 36: ...ays LPT I and the MegaPlus If board s parallel port defaults to LPT2 It can be set to LPT3 if desired see Section 4 2 Your MegaPlus II board is configured at the factory as LPTI If this is the only parallel printer port on your system your MegaPlus II board is ready as shipped 4 1 Installing the Interface Cable Place the MegaPlus II board so that the mounting bracket is towards the right Near the ...

Page 37: ...nel you can knock out the plug in this hole and mount the D type connector to the back panel If your PC has an unused slot you can mount the D connector in the supplied extra bracket and install the bracket in the unused PC slot NOTE It is usually more advisable to route your adapter cable underneath existing boards rather than over the top The close tolerances at the top of the PC may produce som...

Page 38: ...BM PC always sends printer output to parallel port LPTI unless specifically told otherwise Unfortunately PC DOS 1 0 and 1 I will not allow you to redirect output to LPT2 or LPT3 Appendix B of this manual gives information on how to cause the PC to send printer output to LPT2 Although it is not required you may want to use the DOS MODE command to set the line width and the number of lines per page ...

Page 39: ...ine Configuration AST Adapter IBM Line J2 Cable Output Matrix Name Pin DB25S Printer STROBE 1 1 1 00 3 2 2 Dl 5 3 3 D2 7 4 4 03 9 5 5 04 11 6 6 05 13 7 7 06 15 8 8 07 17 9 9 ACK 19 10 10 BUSY 21 11 11 PE 23 12 12 SLCT 25 13 13 AUTOFO 2 14 14 ERROR 4 15 32 INIT 6 16 31 SLCT IN 8 17 36 GROUND 10 12 14 16 18 25 16 19 30 33 4 4 18 20 22 24 NOTE A dash in front of the line name denotes lines which are ...

Page 40: ...4 5 Disabling the Parallel Printer Port The parallel printer port on the MegaPlus II board can be completely disabled by removing the jumper discussed in Section 4 2 4 5 ...

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Page 42: ...the DOS operating system issues each time you boot the system 5 1 The Clock Calendar Battery The lithium battery is easily replaceable and should last for about a year Since the battery is used only when your PC is not operating the actual life of your battery will be determined by how much the PC is used To replace the battery slightly lift the retaining clip with your finger or a mall screwdrive...

Page 43: ...stalling your MegaPlus II board you must prepare your working DOS diskettes to automatically initialize the time and date each time that you boot the system This section lists the process used to invoke your Clock Calendar STEP 1 If you have not already done so copy the two clock programs ASTCLOCK COM and SETCLOCK COM to your working DOS diskette These programs are on the SuperPak diskette supplie...

Page 44: ...DATE variables their initial value as detailed in Section 5 3 5 3 The SETCLOCK Utility Setting the MegaPlus II Time and Date You need to execute the SETCLOCK utility whenever you want to correct the time or date of the MegaPlus II board s internal microprocessor clock The DOS TIME and DATE commands only update the system s time and date parameters they will not update the time and date values stor...

Page 45: ...but do not press the Enter key observe a digital clock or watch and press Enter when the seconds reading on the clock catches up to the value that you typed in STEP 5 Reboot the system press Ctr and Alt simultaneously and hold while pressing Del to install the new TIME and DATE values 5 4 Device Addressing of the Clock Calendar This technical information is for reference only you do not need to re...

Page 46: ...MegaPak option The MegaPak plugs onto connector J5 on the MegaPlus II board see Figure I I for clarification If you purchase the MegaPlus II with the MegaPak option the piggyback board will already be installed on the MegaPlus II board No changes to switch settings or jumper blocks are required on the MegaPlus II when installing the MegaPak However if you have a PC lor PC 2 you should set Switch 2...

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Page 48: ... 1 Installing the Game Adapter Piggyback Board Place the MegaPlus II board so that the mounting bracket is towards the right Find the 16 pin connector that is designated a J1 on the piggyback board see Figure 7 1 Plug the cable s connector into J1 on the piggyback board making sure that pin 1 on the cable is matched up with pin I on J I Pin I on J I is designated by a I the V shaped notch on the c...

Page 49: ...the Game Adapter Port The game adapter port can be completely disabled by removing the piggyback board from the MegaPlus II board This is done by disassembling the screw set that connects the two boards together found near the top of the mounting bracket at the right end of the MegaPlus II board and unplugging the piggyback s 62 pin femaJe connector from the 62 pin male connector on the MegaPlus I...

Page 50: ... position its front bottom corner in the card guide channel not the MegaPak Keeping the top of the MegaPlus II board level lower the MegaPlus II board until its edge connector is resting on the expansion slot receptacle Using evenly distributed pressure press the MegaPlus II board straight down until it is seated in the expansion slot Replace the bracket retaining screw that was removed in step 1 ...

Page 51: ...the power up diagnostics will be longer than it was prior to installing the MegaPlus II board This is because additional memory is tested to be sure it is functioning properly A delay of 30 or more seconds is normal 8 2 I If everything was done properly the system will boot as normal If you get an error message or nothing happens it is probably because the switch settings on the PC system board an...

Page 52: ...e IBM diagnostic routines to check out the options you have just installed See your IBM Guide 10 Operations manual for instruction NOTE The diagnostic routines do not test the Clock Calendar feature 3 After you have finished the diagnostic routines insert the DOS diskette that you have installed with the AUTOEXEC BAT file in Section 5 Reboot the system press CTRL and ALT and hold while pressing DE...

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Page 54: ...es of 64K dynamic RAM chips Second Serial Option Order part number MG OOOS for the async communication RS 232 upgrade kit which consists of a UART interface ICs adapter cable and documentation Parallel Printer Option Order part number MG OOOP for the parallel printer upgrade kit which consists of all the necessary ICs printer adapter cable and documentation MegaPak Option Order part number MPK 256...

Page 55: ...gyback board and a game adapter cable OTE ALTHOUGH THE AST RESEARCH MEGAPLUS II BOARD IS DESIGNED FOR EASY USER EXPANSION THE WARRANTY COVERAGE APPLIES ONLY TO THE CONFIGURATION OF THE BOARD AS ORIGINALLY SHIPPED FROM THE FACTORY THE EXPANSION SOCKETS AND ANY ADDITIONAL EXPANSION RELATED COMPONENTS ARE NOT WARRANTED ...

Page 56: ...call your printer manufacturer and tell them you wish to connect to an IBM PC asynchronous serial port DTE Type Cabling The following interface diagrams refer to DTE interfaces only such as the serial port on the MegaPlus II board Suggested wiring to modem devices Hayes Stack Smart modem Novation Cat UDS etc MegaPlus II Serial Port Connector Modem Port Connector 1 J 2 2 3 3 4 4 5 5 6 6 7 7 8 8 20 ...

Page 57: ...only NEC Anadex only Pins 6 and 8 on the PC side are wired together and connected to pin 20 from the printer The same is true at the printer side This wiring allows the printer to inform the PC that its receiving buffer is full Use a OB25S female socket connector for the MegaPlus II board s serial port and a OB25P male plug for the printer If you have a printer like the NEC 7720 which requires a O...

Page 58: ...for CRTs and printers running at low baud rates 110 300 MegaPlus II Serial Port Connector CRT Printer Port Connector 1 1 2 3 3 2 7 7 4 5 6 8 20 5 20 or 4 5 if needed This wiring does not use standard EIA RS 232C handshaking however it should work with most CRTs and some printers Use DB25S female socket for the MegaPlus II board s serial port and a DB25P male plug for the CRT or printer in most cas...

Page 59: ...the PC side are wired together and then commonly connected to pin 1 20 on the Diablo 620 side There are several different versions of the Diablo 630 printer available We have had the best success with the following wiring for the serial interface MegaPlu5 II Serial Port Connector Diablo 630 Serial Port Connector I I 2 3 3 2 5 11 7 7 6 8 20 6 or 6 4 If the above wiring does not work for you you wil...

Page 60: ... these printers sufficient control over output from the PC side of the interface Notice that pins 6 8 and 20 are connected to each other on either side of the link for the TP I This allows both devices to remain in a ready state while pins 4 and 5 actually control the flow of data from one side to the other Suggested wiring for the Hewlett Packard 7470A plotter MegaPlus II Serial Port Connector HP...

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Page 62: ...ace or change each line in programs where LPTI or LPT2 appear as your output port designation If your printers are not configured to the same parameters as defined in the PC DOS MODE command it will be necessary to add two MODE statements when switching devices You will note that the swap program below is written in BASIC Since the printer port swap is best handled in DOS it is necessary to invoke...

Page 63: ...address to LPT I LPT 1 address to LPT2 return to DOS Omit the last statement if you will be LPRINTing from BASIC To restore LPTI to LPTI AND ALSO to restore LPT2 to LPT2 Use the same program LPTSWAP to restore your parallel printer ports to their original arrangement Be sure to restore the proper parameters using a new batch file and MODE statements LPTRSTR BAT is as follows B 2 10DE LPT1 paramete...

Page 64: ...ction counter Ill 0000 of seconds counter I I and 1 I0 seconds counter seconds counter minutes counter hours counter day of the week counter day of the month counter month RAM upper nibble only RAM last month storage RAM year storage 80 RAM reserved RAM not used RAM not used RAM not used RAM not used interrupt status register interrupt control register counter reset RAM reset status bit GO command...

Page 65: ...Counter and RAM Reset Format C 2 Data 01 02 04 08 10 20 40 80 Function 1110000 of seconds III 00 and 1110 of seconds seconds minutes hours days of the week days of the month months ...

Page 66: ...s to your master diskettes use backups onlY Test the patched version before actually using it ln the following procedures the user enters all boldface text exactly as shown be sure to include spaces The computer responds with all other output Refer to your DOS manual for more information on using the DEBUG commands Patch for DOS 1 1 Version of D1SKCOPY Utilit The following patch fixes a problem in...

Page 67: ...ng patch fixes a problem in orSKCOMP when you have a large amount of memory and double sided drives A DEBUG DISKCOMP COM enter E6EC E8 79 00 enter E768 3D 5100 72 02 BO 50 A2 95 04 C3 enter RCX enter CX 0668 673 enter w enter Writing 0673 bytes Q enter A D 2 ...

Page 68: ... a MOdulator DEModulator used to connect a terminal to a communications device The communications device interfaces to a transmission medium for example phone lines which carries the signal to a similar device connected to a port on another DTE port or the communications element of a mainframe computer system either of which we can call the remote The EIA standard provides for various signals to b...

Page 69: ... is being requested by the terminal device Assuming that an open phone line exists the DCE brings up two lines on its side of the interface DSR Data Set Ready pin 116 and DCD Data Carrier Detect pin 118 When the DTE remember that s your PC port sees voltage at its pins 6 and 8 it is free to bring up pin 114 RTS Request to Send This tells the DCE in effect I ve got data to transmit to you right now...

Page 70: ...l From the DTE s standpoint he must send DTR see DCD see DSR send RTS and see CTS before he can transmit or receive data That is the input signals must have voltage applied to them or the interface cannot become operational The output signals matter only in that they are input to the DCE side of the interface The hardware which controls the DTE serial interface will not release data to the communi...

Page 71: ... a DTE to DTE interface Such an interface must fool each side of the link into thinking that it is receiving response input signals from a DCE As mentioned above not only must the input voltages be present but they must become present in the proper sequence although this varies from device to device To illustrate let s look at the case presented in Figure E 2 PC Serial Port Side Signal Pin Ground ...

Page 72: ...The remainder of the interface will idle until the printer raises DTR again Remember this is a specific case for Qume serial printers Let s look at another example of interfacing a serial DTE printer to the PC s AST Research board s serial port In this case the printer uses line 19 a Secondary Request to Send SRTS instead of pin 4 Other than this oddity careful examination of the interface will sh...

Page 73: ...ormation to go on call or write the device company and tell them you are interfacing their product to an IBM Personal Computer asynchronous serial port Serial ports on all AST Research boards are set up to be functionally identical to the IBM product The appendices of your AST Research product manual may also be of some help and your dealer can usually assist you if you have problems Your dealer c...

Page 74: ...Output RTS 4 Input CTS 5 Data Out TxD 2 Data In RxD 3 Serial Peripheral Device Pin Signal Ground ______________________ 7 Ground Figure E 4 Serial Interface Form Helpful Hint If you have several different serial devices which will be using your serial port make all of your wiring translations in small assemblies Then you can use the same long cable to connect your PC to any of these devices E 7 ...

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Page 86: ...of loss or damage in transit You also agree to prepay shipping charges to AST ALL EXPRESS AND IMPLIED WARRANTIES FOR THIS PRODUCT INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED IN DURATION TO THE ABOVE 1 YEAR PERIOD Some states do not allow limitations on how long an implied warranty lasts so the above limitations may not apply to yo...

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