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> EXP Exchange Rabbit 4000 Instruction

> Opcode | Instruction | Clocks | Operation
> ED D9 | EXP | 4(2,2) | PW <-> PW' PX <-> PX' PY <-> PY' PZ <-> PZ'

> Flags | ALTD | IOI/IOE
> S | Z | L/V | C | F | R | SP | S | D
> - | - | - | - |  |  |  |  |

> #### Description

> Exchanges PW, PX, PY and PZ with their respective alternate registers, PW', PX', PY' and PZ'.

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