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[/] [w11/] [tags/] [w11a_V0.7/] [doc/] [w11a_known_issues.txt] - Diff between revs 5 and 21
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# $Id: w11a_known_issues.txt 317 2010-07-22 19:36:56Z mueller $
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# $Id: w11a_known_issues.txt 516 2013-05-05 21:24:52Z mueller $
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Summary of known issues for w11a CPU and systems
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Summary of known issues for w11a CPU and systems
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Table of content:
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Table of content:
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1. Known differences between w11a and KB-11C (11/70)
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1. Known differences between w11a and KB-11C (11/70)
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the 22bit extended mode address space. With UNIBUS mapping enabled, this
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the 22bit extended mode address space. With UNIBUS mapping enabled, this
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allowed to access via 17000000:17757777 the memory exactly as a UNIBUS
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allowed to access via 17000000:17757777 the memory exactly as a UNIBUS
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device would see it. The w11a doesn't implement this remapping, an access
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device would see it. The w11a doesn't implement this remapping, an access
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in the range 17000000:17757777 causes a NXM fault.
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in the range 17000000:17757777 causes a NXM fault.
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All four points relate to very 11/70 specific behaviour, not operating system
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All four points relate to very 11/70 specific behaviour, no operating system
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depends on them, therefore they are considered acceptable implementation
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depends on them, therefore they are considered acceptable implementation
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differences
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differences
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2. Known limitations ------------------------------------------------------
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2. Known limitations ------------------------------------------------------
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