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TT-99.002
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1991-08-21
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48 lines
AMI TECH TIP
TECH TIP NO. 99.002
DATE: August 17, 1991
BOARD TYPE: All EISA Motherboards
ORIGINATOR: Rex Wade
RELEASED BY: Documentation Control
PROBLEM: The Impact Super VGA card from Trident may have problems
working correctly in some systems. The symptoms may be
one or more of the following: (A) The system may hang
during boot-up or (B) some characters may be missing
from the screen or (C) the colors may be incorrect.
REASON: The Impact Super VGA decodes all of the addresses between
A0000 and DFFFF (hex). This causes a conflict with other
cards that may be in the system that are using a portion
of the addresses in this range. It could also cause
problems with memory manager software that tries to use
this portion of memory.
SOLUTION: Locate the DIP switches on the right side of the Impact
Super VGA card. Set switch 4 to the OFF position and
switch 5 to the ON position. This will cause the Impact
Super VGA card to decode only the addresses that it is
actually using (A0000 to C7FFF hex). The Impact manual
is incorrect because it does not even mention switch 4.
There is also a new version of the Impact Super VGA by
Trident that does not have the DIP switches. It is
labeled `LC2' in the upper right hand corner. In this
case there is a jumper (shunt) labeled SW4 which must be
installed to correct this problem. The new manual does
mention jumper SW4 on page 4-2 but is not as clear as it
should be about it's function.
NOTE: On some motherboards everything may seem to be working correctly
even though the conflict exists. Check your system carefully
because long term reliability may be degraded if a system runs
for a long period of time with a bus conflict.