Genesis-Plus-GX/source/types.h

#undef uint8
#undef uint16
#undef uint32
#undef int8
#undef int16
#undef int32

#define uint8  unsigned char
#define uint16 unsigned short
#define uint32 unsigned int
#define int8  signed char
#define int16 signed short
#define int32 signed int

typedef union
{
    uint16 w;
    struct
    {
#ifdef LSB_FIRST
        uint8 l;
        uint8 h;
#else
        uint8 h;
        uint8 l;
#endif
    } byte;

} reg16_t;