def RTI(cpu: CPU6502):
cpu.state.status = cpu.pop_value_from_stack()
cpu.state.set_flag(Flags6502.U, 1)
cpu.state.set_flag(Flags6502.B, 0)
cpu.pop_program_counter_from_stack()
return 0
def PLP(cpu: CPU6502):
cpu.state.status = cpu.pop_value_from_stack()
cpu.state.set_flag(Flags6502.U, 1)
cpu.state.set_flag(Flags6502.B, 0)
return 0
def PLA(cpu: CPU6502):
cpu.state.a = cpu.pop_value_from_stack()
cpu.state.set_flag(Flags6502.Z, cpu.state.a == 0x00)
cpu.state.set_flag(Flags6502.N, cpu.state.a & 0x80)
return 0
