IDE_DEFAULT_ADDRESS
{ "ace", AIC_SYSTEM_ACE, IDE_DEFAULT_ADDRESS, NULL, sizeof(struct _Sac) },
{ "ace", AIC_SYSTEM_ACE2, IDE_DEFAULT_ADDRESS+256, NULL, sizeof(struct _Sac) },
#define SAC0 ((struct _Sac *)IDE_DEFAULT_ADDRESS)
#define SAC1 ((struct _Sac *)(IDE_DEFAULT_ADDRESS+256))