36 lines
1.5 KiB
Plaintext
36 lines
1.5 KiB
Plaintext
AST RESEARCH TECHNICAL BULLETIN TB-0065 11-7-84
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AT MOTHERBOARD MEMORY CONFIGURATION
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1. An Advantage! installed in a 256K AT must be configured for
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Split Memory Addressing as shown in Figure 3-4 in the User's
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Manual. In a 512K AT, either Split Memory Addressing or
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Contiguous Memory Addressing may be used on the Advantage!.
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2. The AT system board may be configured with either 256K or
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512K of memory. The position of a shorting plug on the
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system board (J18) determines the proper configuration.
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(J18 is located underneath the disk controller board near
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the front of the AT chassis.)
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Apparently some 256K ATs are shipped from IBM with the
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jumper in the 512K position. This does not cause any
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problems until an Advantage! is installed and configured for
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the Split Memory Addressing mode. An addressing conflict
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results: The "phantom" upper 256K on the system board
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conflicts with the memory on the Advantage! and results in
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errors during POST (typically 040002....210).
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NOTE: As a portion of the data is in pictorial form, it is not
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included here. To obtain a complete copy of this technical
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bulletin, contact:
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AST RESEARCH, INC.
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2121 Alton Avenue
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Irvine, California 92714
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ATTENTION: Product Support
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(Technical Bulletin)
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