============================================================================= AST RESEARCH, INC. TECHNICAL BULLETIN #0697A 08-19-91 ============================================================================= SIMULATION SCIENCES SOFTWARE AND AST 486 SYSTEMS PROBLEM: Systems using the 80486 microprocessor will not recognize the hardware security key, causing Simulation Sciences Inc's Software Process version 4.01 to stop execution. This problem exists on all manufacturers 80486 systems, including AST's that have a parallel port implemented on the motherboard. SOLUTION: This is not an issue that AST can resolve. However, AST systems can be made to operate by disabling cache in system setup. This is a temporary work around and the customer should contact Simulation Sciences Inc. at (714) 579-0412 for proper corrective action.