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 A20 Problems
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     If the fifth digit of the address displayed in the GPF error message,
     when your machine abnormally terminates, is an odd number (for example,
     from 0x10000 to 0x1FFFF, or from 0x30000 to 0x3FFFF), you may be running
     software that requires rigorous management of the A20 line.  Try setting
     the A20 option in the DOS16M environment variable:

     SET DOS16M= A20