Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
MASM 5.1 Compatibility
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     At the end of an integer constant, B and D are ambiguous when the
     current default radix is large enough for B or D to be legal
     digits. In this case, use of B or D causes a radix override.
     Therefore, even if the current default radix is 16, the constant
     123D is interpreted as decimal 123.
 
     The assembler treats an initializer as a binary coded decimal
     number only if the current default radix is 10.
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