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> PUSH SU Stack Operation Rabbit 3000A/4000 Instruction

> Opcode | Instruction | Clocks | Operation
> ED 66 | PUSH SU | 9 (2,2,2,3) | (SP - 1) = SU SP = SP - 1

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

> #### Description

> Pushes SU on the stack. This is a chained-atomic instruction, meaning that an interrupt cannot take place between this instruction and the instruction following it.

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