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AST RESEARCH, INC.          TECHNICAL BULLETIN # 1190              5-19-95

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BRAVO LC 4/66D PS/2 MOUSE NOT RECOGNIZED BY SCO ODT LITE 3.0


PROBLEM

The Bravo LC 4/66D system mouse may not be recognized by SCO ODT Lite 3.0.


CAUSE

The problem is detected when SCO, upon testing for the available hardware 
in the system, issues a "Test Mouse Port" command to the mouse controller.  
The rise time in the Data line is too slow.  
The hardware/software can not detect the correct state of the mouse data 
signal causing the error.

A correction was made to the system board P/N  202688- XXX.  The pull-up 
resistor on the AUX DATA (mouse data) line was changed to a lower value.


SYSTEMS AFFECTED
AST PART NUMBER AND DESCRIPTION

501498-XXX          BRAVO LC 4/66D
501548-XXX          BRAVO LC 4-50D
501433-XXX          BRAVO LC 4-50S
501378-XXX          BRAVO LC 4-33S
501379-XXX          BRAVO LC 4-33
501654-XXX          BRAVO LC 4-50D
501380-XXX          BRAVO LC 4-66D


SOLUTION

Take the system to an AST Authorized Service Center for a system board 
replacement.  Request AST part number 202688- XXX, revision B or higher.