GNU Info

(nasm.info)Section 3.4.1

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3.4.1. Numeric Constants
------------------------

   A numeric constant is simply a number. NASM allows you to specify
numbers in a variety of number bases, in a variety of ways: you can
suffix `H', `Q' or `O', and `B' for hex, octal and binary, or you can
prefix `0x' for hex in the style of C, or you can prefix `$' for hex in
the style of Borland Pascal. Note, though, that the `$' prefix does
double duty as a prefix on identifiers (see *Note Section 3.1::), so a
hex number prefixed with a `$' sign must have a digit after the `$'
rather than a letter.

   Some examples:

             mov     ax,100          ; decimal
             mov     ax,0a2h         ; hex
             mov     ax,$0a2         ; hex again: the 0 is required
             mov     ax,0xa2         ; hex yet again
             mov     ax,777q         ; octal
             mov     ax,777o         ; octal again
             mov     ax,10010011b    ; binary