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JSR direct addressing mode is not supported on MC6800 #17

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@brocci

On MC6800, JSR only provides extended addressing, so it always needs two bytes as an operand, even if the address is on the zero page.
The current cr6800.py fails to handle this properly, generating an undocumented instruction (9D known as HCF):

JSR $0010

is assembled as:

9D 10

instead of:

BD 00 10

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