THE 80286 INSTRUCTION SET

caw-Convert Byte into Word

OpcodeInstruction ClocksDescription

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

8-27

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Image 237
Intel 80286, 80287 manual Caw-Convert Byte into Word, C8W