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29 lines
1.1 KiB
Plaintext
29 lines
1.1 KiB
Plaintext
AST RESEARCH TECHNICAL BULLETIN TB-0002 4-16-84
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POWER-ON SELF TEST ERROR ON XT AND PORTABLE COMPUTERS
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When the IBM-XT or portable computer is powered-on, the system
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BIOS initializes a Power-On Self Test (POST). In the upper left-
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hand corner of the screen, the progress of the POST is displayed
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in the format:
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XXX KB OK
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The number (XXX) should continue to increase until it equals the
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amount of memory installed in the system. Normally, this test
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takes 23 to 90 seconds to complete, depending on the amount of
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memory installed. Upon completion, the system will attempt to
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boot the diskette in drive A.
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However, if switch 1 of the switch system board switch block is
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"ON", the POST will re-initialize and start over. This will
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continue in an endless loop.
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This problem can be resolved by removing power from the system,
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positioning switch 1 in the "OFF" position and then re-applying
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power to the system.
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The IBM Guide to Operations refers to this switch only as "Normal
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operation; always off".
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