BANKSWITCH INSTRUCTIONS:

FSBP0:      OPCODE: db,e8     IIT ONLY
            Selects the original bank. (default) (6 clocks)


FSBP1:      OPCODE: db,eb     IIT ONLY

            Selects bank 1 from FMUL4X4 instruction diagram (6 clocks)


FSBP2:      OPCODE: db,ea     IIT ONLY

            Selects bank 2 from FMUL4X4 instruction diagram (6 clocks)

FSBP3:      OPCODE: db,e9     IIT ONLY   UNDOCUMENTED
            Selects the scratchpad bank3 used by the FMUL4X4 internally.
            Not very useful but funny to look at... How-to: load
            any value into bank 0,1 or 2 until you have a full 8
            registers, then execute this bankswitch. Using a
            debugger like CodeView you are now able to inspect the
            bank3 registers. (most likely to take 6 clocks)



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