Tandy 1000 MS-DOS Reference Manual page 317

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Chapter 14/ Problems and Error Messages
Bad command
MS-DOS issued an invalid command for the device driver. Try
the command again. If it continues to fail, contact the dealer
from whom you bought the device driver.
Bad unit
A device driver passed an invalid sub-unit number. Contact the
dealer from whom you purchased the device driver.
Data
The data cannot be read or written correctly. You probably have
a flawed disk.
Disk
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MS-DOS has found an error it does not recognize.
FeB
unavailable
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FCB's might not be high enough.
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General failure
A hardware error or the disk is not formatted.
Invalid disk change
A diskette was removed while files were open.
Lock violation
All or part of a source file is locked and cannot be read. Wait a
few moments and try again.
No paper
The printer is out of paper.
Non-DOS disk
The disk is not in a format recognizable by MS-DOS.
Not ready
The device is not ready. Check to see that the drive latches are
closed and that all devices are on and ready.
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