PC: $8016, cycles: 7, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----I-- lda #$00 PC: $8018, cycles: 9, registers: [a: $00, x: $00, y: $00, sp: $FD], status: ----IZ- @: pha PC: $8018, cycles: 9, registers: [a: $00, x: $00, y: $00, sp: $FC], status: ----IZ- error: stack underflow!