Paz Schmidt, Alejandro

6809 and 6309 Compatible core

Though JMP indexed instruction such as JMP ,X is not working, I fixed this issue.

JMP indexed not working

I have debugged IRQ/FIRQ behaviors as this IP does not support IRQ/FIRQ functionarities.
I also added HALTREQ/HALTACK functionarities.

IRQ/FIRQ not working

The 6809 has an op-code for negate with carry. Once I needed it and found it. It sits at the expected F/E position when you look at negate, subtract and subtract with carry and do a rectangle using the three known op-codes.

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6809 and 6309 Compatible core