The 68K uses a 24-bit address bus, so the high byte in a 32-bit address is ignored.When given a 16-bit absolute address, the processor sign-extends it to 32 bits before dereferencing it.I'm trying to disassemble a BIOS image for the 68000, and I'm having trouble getting IDA Pro 6.5 to correctly cross-reference addresses.įor those who aren't aware, the Motorola 68000 has a couple of interesting features/quirks related to addressing:
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