PC             wwww wyyy yyyy yyyy
ajmp           abc0 0001 xxxx xxxx
addr jumped to wwww wabc xxxx xxxx

If you looked at my C code you would see that the bits 00001 the base opcode for the AJMP instruction. ( field in my code)

the PC   'wwww wyyy yyyy yyyy' 'iloc' in my code
The bits '00001' is the base opcode for AJMP 'field'
the bits 'abc' are the bits 8..10 of the operand expression 'v'
the bits 'xxxxxxxx' are the bits 0..7 of the operand expression 'v'

the bits 'wwwww' are implied by the location counter.

Eric has suggested that you download a free assembler. So you can test your code against a real assembler.

David.