28 lines
1001 B
Plaintext
28 lines
1001 B
Plaintext
AST RESEARCH TECHNICAL BULLETIN TB-0278A 08/28/87
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RAMPAGE 286
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AST customers have reported some difficulties when using the
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Rampage 286 product. The symptoms occur when the Rampage
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286 is being used to fill in conventional memory (below
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640K).
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The actual symptoms are that data is being corrupted during
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a DMA transfer. This most commonly happens during a copy or
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back-up type operation.
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Rampage 286 boards that may exhibit this tendency can be
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identified by part number "202154-301" revision level "X1".
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These numbers are located on the circuit side of the board,
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along the edge of the board on the end opposite the mounting
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bracket.
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Observe the circuit side of the board and verify if there is
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a jumper wire connected to lifted pin U111-19 (74LS245) to
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pin U76-9 (PLS153). This jumper should correct the problem.
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If the jumper is not installed and the above problem exists,
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contact AST Product Support for further instructions.
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