Reminder:
In order to say the compiler about data type,
these prefixes should be used:
BYTE PTR - for byte.
WORD PTR - for word (two bytes).
For example:
BYTE PTR [BX] ; byte access.
or
WORD PTR [BX] ; word access.
MicroAsm supports shorter prefixes as well:
b. - for BYTE PTR
w. - for WORD PTR
sometimes compiler can calculate the data type automatically, but you may not and should not rely on that when one
of the operands is an immediate value.