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Removed ancient 720 kludge.

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Added support in the T-11 core for an external vector via irq_callback.
Apparently the hardware actually did support this and it is necessary
for emulating the BK 0010/11 computer in MESS.
This commit is contained in:
Aaron Giles 2008-04-17 02:58:24 +00:00
parent 3c35a00e87
commit 2028ecc2f7
1 changed files with 12 additions and 15 deletions
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27
src/emu/cpu/t11/t11.c
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@ -202,24 +202,21 @@ static void t11_check_irqs(void)
/* compare the priority of the interrupt to the PSW */
if (irq->priority > priority)
{
/* get the priority of this interrupt */
int new_pc = RWORD(irq->vector);
int new_psw = RWORD(irq->vector + 2);
int vector = irq->vector;
int new_pc, new_psw;
/* call the callback */
if (t11.irq_callback)
/* call the callback; if we don't get -1 back, use the return value as our vector */
if (t11.irq_callback != NULL)
{
int vector = 0;
if (t11.irq_state & 8) vector = 3;
else if (t11.irq_state & 4) vector = 2;
else if (t11.irq_state & 2) vector = 1;
(*t11.irq_callback)(vector);
int new_vector = (*t11.irq_callback)(t11.irq_state & 15);
if (new_vector != -1)
vector = new_vector;
}
/* kludge for 720 - fix me! */
if (new_pc == 0)
return;
/* fetch the new PC and PSW from that vector */
assert((vector & 3) == 0);
new_pc = RWORD(vector);
new_psw = RWORD(vector + 2);
/* push the old state, set the new one */
PUSH(PSW);
@ -459,7 +456,7 @@ void t11_get_info(UINT32 state, cpuinfo *info)
/* --- the following bits of info are returned as 64-bit signed integers --- */
case CPUINFO_INT_CONTEXT_SIZE: info->i = sizeof(t11); break;
case CPUINFO_INT_INPUT_LINES: info->i = 4; break;
case CPUINFO_INT_DEFAULT_IRQ_VECTOR: info->i = 0; break;
case CPUINFO_INT_DEFAULT_IRQ_VECTOR: info->i = -1; break;
case CPUINFO_INT_ENDIANNESS: info->i = CPU_IS_LE; break;
case CPUINFO_INT_CLOCK_MULTIPLIER: info->i = 1; break;
case CPUINFO_INT_CLOCK_DIVIDER: info->i = 1; break;