© Thomas Kunz 2000
SCE 574
82
Memory Reference Ambiguities
äConsider MOV
[BX],5
äShould we move a
byte or a word?
äNeed to instruct the
assembler
äWORD PTR
äBYTE PTR
äSo we get:
MOV WORD PTR [BX], 5
OR
MOV BYTE PTR [BX], 5
äConsider the
following example
Specify how to interpret
a memory operand, gives
type information
DS 40000
BX 2350
42350
42351
DS:BX
Low byte at low
address, high byte
at higher address
5
0
5
WORD PTR BYTE PTR