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TT-25.001
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1991-08-21
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AMI TECH TIP
TECH TIP NO. 25.001
DATE: May 9, 1991
BOARD TYPE: Enterprise I, Series-25
BOARD REVISION: B
BOARD FREQUENCY: 25MHz or 33MHz
RELEASED BY: Engineering Dept.
PROBLEM: The Impact Super VGA card from Trident may fail when plugged
into the Enterprise I motherboard. (This problem also
affects the Enterprise II motherboard, Series-16, Rev-D
only. See Tech Tip No. 16.001).
REASON: There were two capacitors added to this board with ECN
25.010. They are filter caps to eliminate reflections on
the IORC# and IOWC# signals. These capacitors may cause the
Impact Super VGA card from Trident to fail.
SOLUTION: This problem is currently being evaluated and a solution has
not yet been found that will take care of the reflection
problem and the video problem simultaneously. When a
solution has been reached, an ECN will be implemented
immediately. In the meantime, if a customer must use the
Impact Super VGA card from Trident, he may have to remove
the capacitors soldered on top of U89. However, if he is
using several EISA slots, this may cause other problems such
as "CMOS INOPERATIONAL".