void h6280_set_reg (int regnum, unsigned val)
{
switch( regnum )
{
case REG_PC:
case H6280_PC: PCW = val; break;
case REG_SP:
case H6280_S: S = val; break;
case H6280_P: P = val; break;
case H6280_A: A = val; break;
case H6280_X: X = val; break;
case H6280_Y: Y = val; break;
case H6280_IRQ_MASK: h6280.irq_mask = val; CHECK_IRQ_LINES; break;
case H6280_TIMER_STATE: h6280.timer_status = val; break;
case H6280_NMI_STATE: h6280_set_irq_line( IRQ_LINE_NMI, val ); break;
case H6280_IRQ1_STATE: h6280_set_irq_line( 0, val ); break;
case H6280_IRQ2_STATE: h6280_set_irq_line( 1, val ); break;
case H6280_IRQT_STATE: h6280_set_irq_line( 2, val ); break;
#ifdef MAME_DEBUG
case H6280_M1: h6280.mmr[0] = val; break;
case H6280_M2: h6280.mmr[1] = val; break;
case H6280_M3: h6280.mmr[2] = val; break;
case H6280_M4: h6280.mmr[3] = val; break;
case H6280_M5: h6280.mmr[4] = val; break;
case H6280_M6: h6280.mmr[5] = val; break;
case H6280_M7: h6280.mmr[6] = val; break;
case H6280_M8: h6280.mmr[7] = val; break;
#endif
default:
if( regnum <= REG_SP_CONTENTS )
{
unsigned offset = S + 2 * (REG_SP_CONTENTS - regnum);
if( offset < 0x1ff )
{
WRMEM( offset, val & 0xff );
WRMEM( offset+1, (val >> 8) & 0xff );
}
}
int h6280_execute(int cycles)
{
int in,lastcycle,deltacycle;
h6280_ICount = cycles;
/* Subtract cycles used for taking an interrupt */
h6280_ICount -= h6280.extra_cycles;
h6280.extra_cycles = 0;
lastcycle = h6280_ICount;
/* Execute instructions */
do
{
h6280.ppc = h6280.pc;
#ifdef MAME_DEBUG
{
if (mame_debug)
{
/* Copy the segmentation registers for debugger to use */
int i;
for (i=0; i<8; i++)
H6280_debug_mmr[i]=h6280.mmr[i];
MAME_Debug();
}
}
#endif
/* Execute 1 instruction */
in=RDOP();
PCW++;
insnh6280[in]();
/* Check internal timer */
if(h6280.timer_status)
{
deltacycle = lastcycle - h6280_ICount;
h6280.timer_value -= deltacycle;
if(h6280.timer_value<=0 && h6280.timer_ack==1)
{
h6280.timer_ack=h6280.timer_status=0;
h6280_set_irq_line(2,ASSERT_LINE);
}
}
lastcycle = h6280_ICount;
/* If PC has not changed we are stuck in a tight loop, may as well finish */
if( h6280.pc.d == h6280.ppc.d )
{
if (h6280_ICount > 0) h6280_ICount=0;
h6280.extra_cycles = 0;
return cycles;
}
} while (h6280_ICount > 0);
/* Subtract cycles used for taking an interrupt */
h6280_ICount -= h6280.extra_cycles;
h6280.extra_cycles = 0;
return cycles - h6280_ICount;
}
static int h6280_irq_callback(int irqline)
{
// printf("6280 irq callback: line %d\n", irqline);
h6280_set_irq_line(irqline, CLEAR_LINE);
return 0;
}
