Intel 80286 - Page 237

THE 80286 INSTRUCTION SET
caw -Convert Byte into Word
Opcode Instruction
Clocks Description
98 C8W 2
Convert byte into word (AH = top bit of AL)
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
CBW converts the signed byte in AL to a signed word in AX. It does so by extending the top bit of
AL into all of the bits of AH.
PROTECTED MODE EXCEPTIONS
None
REAL ADDRESS MODE EXCEPTIONS
None
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