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STACKER NOTE Stac Electronics Technical Note
Subject: Stacker coprocessor installation checklist.
Tech008 - 2/20/92
Page 1 of 1
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This note provides a checklist for troubleshooting the Stacker version 1.x
(8 bit) coprocessor, and the Stacker 2.0 XT/8 (8 bit) and AT/16 (16 bit)
coprocessor cards.
Symptoms:
A Stacker coprocessor installation exhibiting the following symptoms will merit
further investigation:
1. During Install, the coprocessor may fail to respond at all the addresses.
2. The Stacker.com message: <Coprocessor card not functioning. Invoking
software driver> may appear at boot time.
Solution:
First check the basics.
1. Check to ensure the card is properly seated in the slot.
2. Check to ensure the /B parameter in the Stacker driver contains a valid
address. Possible base addresses are listed in the 2.0 manual pgs. 43-47
and on page 17 in the version 1 manual.
3. Run Install to test all addresses.
4. Try adding each address to the driver in Config.sys and COLD BOOT (Reset
or a power down/up). A cold boot is necessary to flush addresses.
5. Try a different slot.
6. Try rearranging the order of the cards in the expansion slots.
7. Try disabling SHADOW RAM (Scratch RAM) if present. This is done in the
BIOS setup at boot time or on some memory manager device lines in
Config.sys.
8. If possible, try the card in a 2nd machine to see if the problem is with
the card itself.
Card specific issues:
*XT/8: or a Stacker version 1 coprocessor card,
1. Check for address conflicts with a memory management program. Fixing
this problem usually involves adding memory exclude statements to the
memory management driver. Try starting with the range C400-DFFF to
enable the testing of all possible addresses during Install.
2. If the XT/8 card is in a 386 machine, it may be that the motherboard
maps memory over the addresses that Stacker uses to access the card.
Refer to your system user's guide for more information.
3. Version 1.11 or prior with 16 bit VGA card, there may be a conflict
between the VGA card and the coprocessor. Test the card with the VGA
card set to 8 bit mode. If this eliminates the conflict, call STAC
technical support.
*AT/16
1. Something (usually another add-in card) is 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.
2. The buss speed may be greater than 8 Mhz. This value can sometimes be
set in the BIOS. It is usually set as the clock speed (CLK) divided by
some number. Try setting the speed to 8 Mhz or less to test. If buss
speed is the issue, call STAC technical support.
*MC/16
1. You must install and configure the MC/16 card before installing Stacker.
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1992 STAC ELECTRONICS