NAME	EXT, EXTB -- Sign extend
SYNOPSIS	EXT.W Dn Extend byte to word EXT.L Dn Extend word to long word EXTB.L Dn Extend byte to long word (68020+) Size = (Word, Long)
FUNCTION	Extends a byte to a word, or a word to a long word in a data register by copying the sign bit through the upper bits. If the operation is from byte to word, bit 7 is copied to bits 8 through 15. If the operation is from word to long word, bit 15 is copied to bits 16 through 31. The EXTB copies bit 7 to bits 8 through 31.
FORMAT	15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 0 0 1 0 0 OP-MODE 0 0 0 REGISTER "REGISTER" specifies a data register.
OP-MODE	010 -> Extending from 8 bits to 16 bits. 011 -> Extending from 16 bits to 32 bits. 111 -> Extending from 8 bits to 32 bits.
RESULT	X - Not affected N - Set if the result is negative. Cleared otherwise. Z - Set if the result is zero. Cleared otherwise. V - Always cleared C - Always cleared

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