AST RESEARCH, INC. TECHNICAL BULLETIN TB-0326 10-29-87 AST-3780/NCR PC6 The AST-3780 Product will fail to operate in the NCR PC6 computer running an 8 MHz clock. If the PC6 clock speed is lowered to 4.77 MHz then the product operates correctly. The AST-3780 product will operate correctly at 4, 6, 8, and 10 MHz. The problem is in the NCR PC6 clocking scheme. No further information is available at this time.