CUSTOM
#define amiga_custom ((*(volatile struct CUSTOM *)(zTwoBase+CUSTOM_PHYSADDR)))
DEFINE(C_INTENAR, offsetof(struct CUSTOM, intenar));
DEFINE(C_INTREQR, offsetof(struct CUSTOM, intreqr));
DEFINE(C_INTENA, offsetof(struct CUSTOM, intena));
DEFINE(C_INTREQ, offsetof(struct CUSTOM, intreq));
DEFINE(C_SERDATR, offsetof(struct CUSTOM, serdatr));
DEFINE(C_SERDAT, offsetof(struct CUSTOM, serdat));
DEFINE(C_SERPER, offsetof(struct CUSTOM, serper));
if (CUSTOM(windowid))
#define CUSTOM_OFS(fld) ((long)&((struct CUSTOM*)0)->fld)