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STACKER NOTE                                                   STACKER NOTE
Title: Stacker AT/16 Coprocessor Installation Checklist
STAC FAX Index #2001 - 2/20/92                            
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Background.   

   The Stacker AT/16 coprocessor card is installed by placing the card in
   an available expansion slot in your computer, then running the Stacker
   Install program to select an address for the card.  Normally, this is
   all that needs to be done (no jumpers or special settings required).
   This note outlines trouble shooting guidelines for those rare instances 
   when the card does not respond. 

Symptoms.

   A Stacker AT/16 coprocessor exhibiting the following symptoms will merit 
   further investigation:
   
   1. During the I/O address test phase of the installation, you may 
      find that the card fails to respond at any of the addresses.
   
   2. After successfully selecting an I/O address for the card, upon 
      reboot you may encounter the Stacker message: <Coprocessor card not 
      functioning. Invoking software driver>.   

Checklist. 

   1. Check to ensure the card is properly seated in the expansion slot.  
      The connection should be snug, and the bracket anchored securely to the 
      case.
   
   2. The expansion slot may be defective, try the coprocessor in a different 
      slot.  
   
   3. If you receive the message that the card is not functioning at 
      boot time, check the Stacker device driver statement in Config.sys
      to ensure that a valid coprocessor address is listed.  The /B= 
      parameter designates the I/O address the coprocessor is to use.  The 
      following are possible address values: 200, 220, 240, 260, 280, 
      2A0, 2E0.  Run the Stacker Install to test all of these addresses.
      
   4. If you are still unsuccessful after step 3, it is possible that your
      machine is not properly resetting the addresses after Stacker 
      reboots the machine.  Try manually adding each address, starting with 
      200, to the Stacker device driver in Config.sys, then reboot.  For
      example, to test address 200, edit the Stacker device driver in 
      Config.sys as follows:

           DEVICE=C:\STACKER\STACKER.COM /B=200
      
      Save the file and perform a "cold boot"  ( Use the Reset button or 
      power down then up).  A cold boot is necessary to reset addresses.  
   
   5. Try rearranging the order of the cards in the expansion slots.
   
   6. Something (usually another add-in card) may be conflicting with the 
      address  of your AT/16 card. Check the hardware addresses for your 
      other cards or change the hardware address for the AT/16 card.
   
   7. The system buss speed may be greater than the AT standard of 8 Mhz.  
      This value can sometimes be set in the system BIOS setup.  Examine your 
      BIOS to determine the speed of your buss.  It is usually set as the 
      clock speed (CLK) divided by some number.  Try setting the speed to 
      8 Mhz or less to test.  (See your computer documentation for more 
      information on editing the BIOS).

   8. Try disabling Shadow RAM, if present. Shadow RAM is a set of system ROM 
      BIOS routines that have been copied into RAM for increased speed.  
      Shadow RAM can usually be enabled/disabled in your system BIOS setup or 
      with some memory managers. 

   9. If possible, try the card in a 2nd machine to see if the problem is 
      with the card itself.

  10. If after completing the above steps you are still unable to get the 
      AT/16 coprocessor to function, call Stac Technical Support.
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Copyright 1993, Stac Electronics