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    Intel Math CoProcessor Installation and Configuration Notes: I-M

    Contents:

    • F-H - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES: DOCUMENT 3030
    • IBM - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES
    • I-L - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES
    • M - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES
    
    

    F-H - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES: DOCUMENT 3030

    
       FASTDATA 
    
    
    
         386/25                   Intel387 DX
    
            Set pins 1-2 on JP2 and pins 2-3 on JP4 
    
    
    
       GATEWAY 2000 
    
    
    
         386SX-16                 Intel387 SX 
    
            If the system board in this system is produced by MAIN B,  with a
    
            Quadtel BIOS, install jumper at JP1 to enable MCP. If system board
    
            is produced by FTK, with American Megatrends BIOS, remove jumper
    
            JPY pins 1-2 to enable MCP.
    
    
    
         Intel386/25 and Intel386/Intel387 DX
    
            To enable the mcp you need to set switch bank 1, position 2  to ON.
    
    
    
         486-33                   MCP on chip 
    
            An article in PC Week (Feb 17, 92) described a problem with  the
    
            Gateway 2000 Intel486-33 motherboard. The symptom is a system
    
            lockup. The lockup is caused by a timing problem that causes the
    
            mcp in the Intel486 DX to stop functioning before it has finished
    
            its calculations. Gateway is using a Micronics Gemini motherboard.
    
            Micronics says that a minor fix was all that  was needed. Gateway
    
            offers a free replacement. Gateway can be reached at 800-846-2301.
    
    
    
       HEWLETT PACKARD
    
    
    
         VECTRA                   287XL 
    
            Early Vectras require a "PATCH" program from HP to enable  the 287
    
            work.
    
    
    
       HYUNDAI
    
    
    
         SUPER 386SX-16           Intel387 SX  Remove Jumper J13 
    
    
    
         SUPER 286                287XL        Automatically Enabled 
    
            The motherboard in this system produces more noise than  most.
    
            Since the Intel287XL is more susceptible to noise, this system may
    
            require Intel's NMOS 287-10, which is less susceptible to this
    
            noise.
    
    
    
    

    IBM - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES

    
         PC-1, PC-2, PC/XT,       8087         Switch Block 1, Switch 2 OFF
    
            PORTABLE & 3270 PC
    
    
    
         PS/NOTE 386SL            Intel387 SL
    
            Model 2141-N82,S82,W82
    
            Problems booting the system have been encountered by customers
    
            whose system board barcode starts with the letter Z. If this is the
    
            case, contact IBM for a system board replacement. 
    
    
    
         PS/NOTE 425SL            Not Upgradeable
    
    
    
            This system utilizes a version of Intel486 SL microprocessor which
    
            does not contain a math coprocessor and is not  upgradeable with
    
            Intel487SX Math Coprocessor or the Intel OverDrive Processor.
    
    
    
         PS/2 Thinkpad 350 & 350C Not Upgradeable 
    
            This system utilizes a version of Intel486 SL microprocessor which
    
            does not contain a math coprocessor and is not  upgradeable with
    
            Intel487SX Math Coprocessor or the Intel OverDrive  Processor.
    
    
    
         PS/2 Thinkpad 700, 700C &Intel387 SL 
    
            These systems do not utilize the STOP CLOCK mode of the Intel387 
    
            math coprocessors.
    
    
    
         PS/2 Thinkpad 720, 720C  Intel387 SL 
    
            These systems do not utilize the STOP CLOCK mode of the Intel387 
    
            math coprocessors.
    
    
    
         PS/2 MODEL 56 & 57 SLC   Intel387 SX-20 or  Intel387 SX-25
    
            When this system is upgraded to IBM 486SLC2, it is  compatible ONLY
    
            with the BOX387SX-20 or BOX387 SX-25 math coprocessors. It is NOT
    
            compatible with  BOX387SX, BOX387SX16-25, BOX387SX33, or BOX387SL.
    
    
    
         * IBM PS/2 MODEL 70 & Model 80 
    
            The math coprocessor socket used in this computer doesn't  have the
    
            traditional beveled corner used for orienting the Intel387  DX.
    
            However, a white outline of the socket on the system board  shows a
    
            beveled corner.  Align the beveled corner of the Intel387 DX  with
    
            the beveled corner on this outline.
    
    
    
         PS/2 80/16 (041, 071)*   Intel387 DX 
    
            Run IBM Reference Diskette. While you run Microsoft Excel, lockups
    
            or General Protection Fault error messages may  occur. A software
    
            fix WIN87EM.EXE was created and is available through Intel's online
    
            services.  WIN87EM.DLL,another version of this file, is available
    
            from the Microsoft BBS and Microsoft forum of CompuServe.
    
    
    
         PS/2 80/20 (111, 311)*   Intel387 DX 
    
            Run IBM Reference Diskette. While you run Microsoft Excel, lockups
    
            or General Protection Fault error messages may occur. A software
    
            fix WIN87EM.EXE was created and is available through Intel's online
    
            services.  WIN87EM.DLL, another version of this file, is available
    
            from the Microsoft BBS and Microsoft forum of CompuServe.
    
    
    
         IBM PS/1
    
            There are now two different IBM systems with the same name. One is
    
            an older 8086-based system that was intended for the home PC
    
            market, it had very limited expansion, and an integrated monitor on
    
            top of the PC.  The newer PS/1 has a model number of C92, is based
    
            on the Intel386 SX-16.
    
    
    
         IBM PS/2 XMA Card and the Intel387 DX
    
            Field reports the XMA2EMS device driver causes Lotus 1-2-3 to fail
    
            floating point math operations if the Intel387 DX MCP is installed
    
            in a PS/2 Model 80.  Contact IBM or Lotus to see what fix, if any,
    
            is available.
    
    
    
    

    I-L - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES

    
         INSIGHT 
    
    
    
         386DX-25  With Armas ICM25-2 Motherboard
    
            Jumper JP4 pins 2-3, and JP7 ON 
    
    
    
         INTEL 
    
    
    
         301 SYSTEM BOARD 
    
            PBA 451213-xxx        Intel387 DX 
    
            Remove jumper from E48-E49. Place jumper across E46-E47 
    
    
    
         PBA 149422-xxx      287XL     (SBC Math) with 387 socket  
    
            PBA 451403-xxx      287XL     (SBC Math) with 387 socket 
    
            Early versions of this system board don't support the 387DX.
    
    
    
         The "PBA" number on a sticker in a corner of the system  board 
    
            determines its version.
    
    
    
         302 System Board         Intel387 DX
    
            On PBA # 503081-004, there is no jumper; the system is autosense.
    
    
    
         303 System Board         Intel387 DX 
    
            There are three versions of this motherboard. Two of the versions
    
            require you to set a jumper. These can be  identified by their
    
            PBA#.
    
    
    
         On PBA # 500704 and PBA # 459699 
    
            E43-E44 = MCP Installed  
    
            E44-E45 = MCP Not Installed 
    
            On PBA # 502557 there is no jumper; the system is autosense.
    
    
    
         INBOARD 386 AND 386/PC   Intel387 DX 
    
            On the Intel Inboard 386 accelerator board, the orientation  of the
    
            386DX is not the same as the 387DX.
    
    
    
         SnapIn 386               287XL 
    
            The SnapIn 386 uses the math socket on the motherboard.  
    
    
    
         LASER  
    
    
    
         386SX-16 (slim line case)Intel387 SX 
    
            Jumper JP40 needs to be moved from 2-3 to 1-2. Pins 1-2 are nearest
    
            to the  Silk screened "NPX" on system board.
    
    
    
         386SX-16 (large box)     Intel387 SX 
    
            There are no jumpers or switched to set.
    
    
    
         386SXE                   Intel387 SX 
    
            Jumper JP16 needs to be moved from 2-3 to 1-2. Pins 1-2 are nearest
    
            to the  Silk screened "NPX" on system board.
    
    
    
         386SXT                   Intel387 SX 
    
            Needs to have jumper J2 installed.
    
    
    
         LEADING EDGE 
    
    
    
         386SL Color Notebook     Intel387 SL 
    
            Customer report: When i387 SL was installed, system passed all
    
            Intel diagnostic tests except Conformance Test, which failed
    
            randomly. All applications ran flawlessly. Contact Leading  Edge
    
            for BIOS upgrade.
    
    
    
         MODEL M          8087            Switch-block 3: 6-OFF, 7-OFF 
    
                          8087-2          Switch-block 3: 6-On, 7-OFF
    
    
    
            The Model M requires a special software program to enable  8087.
    
            Call Leading Edge Technical Support at 900-370-4800. 
    
    
    
    

    M - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES

    
         MAGNAVOX
    
            Headstart 500         Intel387 SX
    
            Remove jumper from W12. Set jumper W8 pins 1-2 (When looking at
    
            front of computer, pins 1&2 are the right and middle pins.
    
    
    
         MITSUBA
    
    
    
         NINJA-12                 Intel287 XL
    
            The documentation calls for the C80287A-10.  For more details,
    
            contact Mitsuba Tech support.
    
    
    
         MITSUBISHI 
    
            MP286L                Intel287 XL
    
            If you purchased the MP286L without the math coprocessor,
    
            Mitsubishi requires you to send the MP286L with the proper math
    
            coprocessor to their service center in California for installation.
    
    

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