Add 1 to the Y register, not affecting carry

Operation

Y - 1 -> Y

Table

INY | Increment Index Register Y by 1
================================================

Y - 1 -> Y                       N V - B D I Z C
                                 + - - - - - + -

addressing       assembler    opc  bytes  cycles
------------------------------------------------
implied          INY           C8    1      2

Flags

• Negative: 1 if bit 7 of result is 1; 0 otherwise
• Zero: 1 if result is zero; 0 otherwise