Do not use CAS instruction on TARGET_AMIGA #32
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TAS/CAS/CAS2 instructions use read-modify-write transfer sequences which are unsupported on amiga hardware.
The problem is explained in detail here: https://retrocomputing.stackexchange.com/questions/1494/was-the-mc680x0s-tas-instruction-forbidden-on-amiga-systems-only-when-operating