/* Process a z80 non-maskable interrupt */
void z80_nmi( void )
{
if( z80.halted ) { PC++; z80.halted = 0; }
IFF1 = 0;
Z80_WB_MACRO( --SP, PCH ); Z80_WB_MACRO( --SP, PCL );
/* FIXME: how is R affected? */
/* FIXME: how does contention apply here? */
z80_tstates += 11; PC = 0x0066;
}
/* Process a z80 maskable interrupt */
int z80_interrupt( void )
{
if( IFF1 ) {
/* If interrupts have just been enabled, don't accept the interrupt now,
but check after the next instruction has been executed */
if( z80_tstates == z80.interrupts_enabled_at )
{
return(0);
}
//event_add( z80_tstates + 1, EVENT_TYPE_INTERRUPT );
//puts("Oops");
// return 0;
//}
if( z80.halted ) { PC++; z80.halted = 0; }
IFF1=IFF2=0;
Z80_WB_MACRO( --SP, PCH ); Z80_WB_MACRO( --SP, PCL );
R++;
//printf("IMode: %02x, I: %02x\n", IM, I);
switch(IM) {
case 0: PC = 0x0038; z80_tstates += 6; break;
case 1: PC = 0x0038; z80_tstates += 7; break;
case 2:
{
uint16 inttemp=(0x100*I)+0xff;
PCL = Z80_RB_MACRO(inttemp++); PCH = Z80_RB_MACRO(inttemp);
z80_tstates += 7;
break;
}
}
return 1; /* Accepted an interrupt */
} else {
return 0; /* Did not accept an interrupt */
}
}
/* Process a z80 maskable interrupt */
int z80_interrupt( void )
{
if( IFF1 ) {
/* If interrupts have just been enabled, don't accept the interrupt now,
but check after the next instruction has been executed */
if( z80_tstates == z80.interrupts_enabled_at ) {
return 0;
}
if( z80.halted ) { PC++; z80.halted = 0; }
IFF1=IFF2=0;
Z80_WB_MACRO( --SP, PCH ); Z80_WB_MACRO( --SP, PCL );
R++;
switch(IM) {
case 0: PC = 0x0038; z80_tstates += 7; break;
case 1: PC = 0x0038; z80_tstates += 7; break;
case 2:
{
uint16 inttemp=(0x100*I)+0xff;
PCL = Z80_RB_MACRO(inttemp++); PCH = Z80_RB_MACRO(inttemp);
z80_tstates += 7;
break;
}
//default:
// ui_error( UI_ERROR_ERROR, "Unknown interrupt mode %d", IM );
// fuse_abort();
}
return 1; /* Accepted an interrupt */
} else {
return 0; /* Did not accept an interrupt */
}
}
