Castlevania (NES 1987) Game Genie Codes

Castlevania (Konami 1987)

OXNGLZVK - Infinite lives
AXOGOPIE - Start with 40 power hearts
ASOGOPIA - Start with 80 power hearts
SXXXYAAX - Infinite time
GZOGYUSE - Keep weapons after losing a life
ZEUTAYAA - Gain rapid fire shots on weapon pick-up
KZSSEZKA + KXESUZKA - Weapons don't use power hearts
PANKXPGA + PANGSAGA - Start with 1 life
AANKXPGE + AANGSAGE - Start with 8 lives

Source: GameGenie.com