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 Critical error handler table
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 Block device error codes

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 Error code       Meaning
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  0               Attempt to write on a write-protected disk.
  1               Unknown device.
  2               Drive is not ready.
  3               Unknown command issued to device.
  4               CRC error in data.
  5               Drive request structure length is invalid.
  6               Drive seek error.
  7               Unknown media type.
  8               Requested sector not found.
  9               Printer out of paper.
 10               Write fault.
 11               Read fault.
 12               General failure.
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 Character device codes

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 Code             Character device
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 0                Standard input device.
 1                Standard output device.
 2                Current NULL device.
 3                Current CLOCK device.
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 Disk area codes

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 Code             Disk area
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 0                MS-DOS area
 1                File allocation area
 2                Directory
 3                Data area
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 Critical error handler return values

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 Return value     Meaning
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 0                Ignore the error
 1                Retry the operation
 2                Abort program by issuing interrupt 23h
 3                Fail the system call that is in progress
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