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konami/viper.cpp: filter irq state change until current one is actually serviced, make everything more stable

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angelosa 2023-12-04 01:58:44 +01:00
parent 94b1dd88f8
commit ec7d9d5f5e
1 changed files with 5 additions and 1 deletions
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6
src/mame/konami/viper.cpp
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@ -785,7 +785,7 @@ void viper_state::pci_config_data_w(uint64_t data)
// TODO: timing calculation, comes from fdr / dffsr
// most if not all games in the driver sets fdr = 0x27 = 512, dffsr = 0x21
// code1db is *extremely* sensitive to this value
// code1db is *extremely* sensitive to this value, should really be divided by 10
#define I2C_TIMER_FREQ (SDRAM_CLOCK / 512) / 64
uint8_t viper_state::i2cdr_r(offs_t offset)
@ -1138,6 +1138,10 @@ void viper_state::epic_update_interrupts()
int irq = -1;
int priority = -1;
// Do not change the state until current irq is fully serviced.
if (m_epic.active_irq >= 0)
return;
// find the highest priority pending interrupt
for (i=MPC8240_NUM_INTERRUPTS-1; i >= 0; i--)
{