IF_COPER
if (ints & IF_COPER) {
amiga_custom.intreq = IF_COPER;
(cop++)->l = CMOVE(IF_SETCLR | IF_COPER, intreq);
#define VBlankOn() custom.intena = IF_SETCLR|IF_COPER
#define VBlankOff() custom.intena = IF_COPER