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Jonathan Campbell 2018-02-12 11:37:22 -08:00
parent 9ceee883e1
commit e14a1fef1b
1 changed files with 1 additions and 1 deletions
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src/hardware/pic.cpp
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@ -751,7 +751,7 @@ void PIC_Reset(Section *sec) {
* 1.19MHz clock rate also given to the PIT (divided down from 14MHz * 1.19MHz clock rate also given to the PIT (divided down from 14MHz
* on IBM PC/XT hardware). Perhaps it takes a few of these clock ticks * on IBM PC/XT hardware). Perhaps it takes a few of these clock ticks
* for the PIC to process the interrupt? --Jonathan C. */ * for the PIC to process the interrupt? --Jonathan C. */
/* let's guess it takes the PIC 2 clock cycles for IRQ to CPU interrupt to happen */ /* let's guess that it takes the PIC 2 PIC clock cycles for IRQ to CPU interrupt to happen */
PIC_irq_delay_ns = 1000000000UL / ((unsigned long)PIT_TICK_RATE * 2UL); PIC_irq_delay_ns = 1000000000UL / ((unsigned long)PIT_TICK_RATE * 2UL);
PIC_irq_delay_update(); // precompute into CPU cycles counts for emulation PIC_irq_delay_update(); // precompute into CPU cycles counts for emulation