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More on SetER11

I just looked at the code again and remembered why we actually
did it that way. First we set ES to 1 so that BX() won't
generate a beep. Then we set
ES back to 0 to re-enable error handling. If you don't mind an
extraneous beep (and message) in your routines, you can get by
handily with just BX().

Tim Baehr