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m6502: don't detect edge triggered inputs before the first clockcycle

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hap 2023-07-25 21:36:04 +02:00
parent f1e86f85c0
commit 5bfad7e877
1 changed files with 2 additions and 2 deletions
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4
src/devices/cpu/m6502/m6502.cpp
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@ -412,12 +412,12 @@ void m6502_device::execute_set_input(int inputnum, int state)
case IRQ_LINE: irq_state = state == ASSERT_LINE; break;
case APU_IRQ_LINE: apu_irq_state = state == ASSERT_LINE; break;
case NMI_LINE:
if(!nmi_state && state == ASSERT_LINE)
if(machine().time() > attotime::zero && !nmi_state && state == ASSERT_LINE)
nmi_pending = true;
nmi_state = state == ASSERT_LINE;
break;
case V_LINE:
if(!v_state && state == ASSERT_LINE)
if(machine().time() > attotime::zero && !v_state && state == ASSERT_LINE)
P |= F_V;
v_state = state == ASSERT_LINE;
break;