10.3 Prefix 'dup' - repeat instructions DB/DW/DD
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The repeat prefix 'dup' can be used with assembler instructions DB, DW
or DD, as follows:
$DW NUMREP dup VALTOREP
NUMREP - number of repeats of instruction DW
VALTOREP - value to repeat NUMREP times
In contrast to the analogous prefix in assembler, the repeated value
cannot be placed in brackets.